feat(web2): DbConnectionPopover 多连接列表 + IdCardTool 适配

- DbConnectionPopover.vue
  - 触发器显示：「display · host:port」
  - 弹框按 db_type 分组（MySQL / 达梦 / Oracle），每组下显示该 type 的所有连接
  - 每行：连接名 + host:port + 测试/切换按钮
  - 切换按钮独立判断 isCurrent(db_type, id)，不再按 db_type 切换
  - 弹框宽度 280 → 320（容纳 host:port 信息）
- IdCardTool.vue
  - state.currentType 引用全部替换为 currentConnection?.host
  - db_type 从 conn.db_type 取（store 已注入），不再用 state.currentType

web2/src/components/DbConnectionPopover.vue

+<!--
+  数据库连接选择器（Header 右上角 popover）
+
+  2026-08-17 起：每个 db_type 下可配多套连接，UI 列表化展示 + 独立切换。
+  - 同一 db_type（如 mysql）可能有多个连接（生产 / 备份 / 测试...）
+  - 当前激活的是具体某一个连接（state.currentConnection = {db_type, id}）
+  - 弹框分组：按 db_type 分组，每组下面列出该 type 的所有连接
+
+  触发器显示：当前连接的 display + host:port
+  弹框列表：每个连接一行，点击「切换」按钮切到该连接
+-->
 <template>
   <el-popover
-    :width="280"
+    :width="320"
     placement="bottom-end"
     trigger="click"
   >
@@ -15,67 +26,89 @@
       >
         <el-icon><Connection /></el-icon>
         <span class="db-trigger__label">
-          {{ currentLabel }} · {{ currentConn.host }}:{{ currentConn.port }}
+          {{ triggerLabel }}
         </span>
         <el-icon class="db-trigger__arrow"><ArrowDown /></el-icon>
       </el-button>
     </template>
 
-    <!-- 弹出内容：极简列表 -->
+    <!-- 弹出内容：分组列表 -->
     <div class="db-popover">
       <div class="db-popover__title">
         <el-icon><Connection /></el-icon>
         <span>数据库连接</span>
       </div>
 
-      <ul class="db-popover__list">
-        <li
-          v-for="opt in dbTypes"
-          :key="opt.value"
-          :class="['db-popover__item', { 'is-active': opt.value === state.currentType }]"
-        >
-          <div class="db-popover__brand">
-            <img
-              v-if="brandOf(opt.value).url && !logoFailed[opt.value]"
-              :src="brandOf(opt.value).url"
-              :alt="opt.label"
-              class="db-popover__logo"
-              @error="onLogoError(opt.value)"
-            />
-            <span
-              v-else
-              class="db-popover__logo db-popover__logo--fallback"
-              :style="{ background: brandOf(opt.value).color }"
-            >
-              <el-icon><component :is="brandOf(opt.value).fallbackIcon" /></el-icon>
-            </span>
-            <span class="db-popover__name">
-              {{ presets[opt.value]?.display || presets[opt.value]?.database || opt.label }}
-            </span>
-          </div>
-          <div class="db-popover__actions">
-            <el-button
-              link
-              size="small"
-              :loading="testing === opt.value"
-              :title="`测试 ${opt.label}`"
-              @click="onTest(opt.value)"
-            >
-              <el-icon><VideoPlay /></el-icon>
-            </el-button>
-            <el-button
-              type="primary"
-              link
-              size="small"
-              :disabled="opt.value === state.currentType"
-              :title="`切换到 ${opt.label}`"
-              @click="onSwitch(opt.value)"
-            >
-              <el-icon><Position /></el-icon>
-            </el-button>
-          </div>
-        </li>
-      </ul>
+      <div v-if="!hasAnyConnection" class="db-popover__empty">
+        暂无可用连接，请检查 web2/configs/db_defaults.yaml
+      </div>
+
+      <!-- 按 db_type 分组，每组下面是该 type 的所有连接 -->
+      <div
+        v-for="opt in dbTypes"
+        :key="opt.value"
+        class="db-popover__group"
+      >
+        <div class="db-popover__group-head">
+          <img
+            v-if="brandOf(opt.value).url && !logoFailed[opt.value]"
+            :src="brandOf(opt.value).url"
+            :alt="opt.label"
+            class="db-popover__logo"
+            @error="onLogoError(opt.value)"
+          />
+          <span
+            v-else
+            class="db-popover__logo db-popover__logo--fallback"
+            :style="{ background: brandOf(opt.value).color }"
+          >
+            <el-icon><component :is="brandOf(opt.value).fallbackIcon" /></el-icon>
+          </span>
+          <span class="db-popover__group-name">{{ opt.label }}</span>
+          <span class="db-popover__group-count">{{ (presets[opt.value] || []).length }}</span>
+        </div>
+
+        <ul class="db-popover__list">
+          <li
+            v-for="conn in presets[opt.value] || []"
+            :key="conn.id"
+            :class="['db-popover__item', { 'is-active': isCurrent(opt.value, conn.id) }]"
+          >
+            <div class="db-popover__conn">
+              <div class="db-popover__conn-name">
+                {{ conn.display || conn.database || conn.id }}
+              </div>
+              <div class="db-popover__conn-host">
+                {{ conn.host }}:{{ conn.port }}
+              </div>
+            </div>
+            <div class="db-popover__actions">
+              <el-button
+                link
+                size="small"
+                :loading="testing === `${opt.value}::${conn.id}`"
+                :title="`测试 ${conn.display || conn.id}`"
+                @click="onTest(opt.value, conn.id)"
+              >
+                <el-icon><VideoPlay /></el-icon>
+              </el-button>
+              <el-button
+                type="primary"
+                link
+                size="small"
+                :disabled="isCurrent(opt.value, conn.id)"
+                :title="`切换到 ${conn.display || conn.id}`"
+                @click="onSwitch(opt.value, conn.id)"
+              >
+                <el-icon><Position /></el-icon>
+              </el-button>
+            </div>
+          </li>
+          <li v-if="!(presets[opt.value] || []).length" class="db-popover__none">
+            该类型无连接
+          </li>
+        </ul>
+      </div>
     </div>
   </el-popover>
 </template>
@@ -92,46 +125,57 @@ const {
   presets,
   loading,
   currentConnection,
-  setDbType,
+  setCurrentConnection,
 } = useDbConnection()
 
 const dbTypes = DB_TYPES
-/** 当前正在测试的 db_type（null = 没在测试） */
+/** 当前正在测试的连接 key（"db_type::id" 格式）；null = 没在测试 */
 const testing = ref(null)
 /** 哪些 db_type 的 logo 加载失败过 → 切到 fallback icon */
 const logoFailed = reactive({})
 
 const currentConn = computed(() => currentConnection.value || {})
-const currentLabel = computed(
-  () => dbTypes.find((d) => d.value === state.currentType)?.label || state.currentType,
+/** 触发器显示：「display · host:port」 */
+const triggerLabel = computed(() => {
+  const c = currentConn.value
+  if (!c.host) return '未选择连接'
+  const name = c.display || c.database || c.id
+  return `${name} · ${c.host}:${c.port}`
+})
+const connected = computed(() => !!currentConn.value?.host)
+const hasAnyConnection = computed(() =>
+  Object.values(presets.value || {}).some((v) => Array.isArray(v) && v.length > 0),
 )
-const connected = computed(() => !!state.currentType)
+
+/** 是否是当前激活连接 */
+function isCurrent(dbType, id) {
+  const cur = state.currentConnection
+  return !!cur && cur.db_type === dbType && cur.id === id
+}
 
 function brandOf(dbType) {
   return DB_LOGOS[dbType] || { url: null, color: '#909399', fallbackIcon: null }
 }
 
 function onLogoError(dbType) {
-  // 网络问题 / CDN 失效 → 切到 Element Plus icon 兜底，不再尝试
   logoFailed[dbType] = true
 }
 
 /**
- * 测试指定 db_type 的连接
+ * 测试指定连接
  */
-async function onTest(dbType) {
-  const conn = presets.value[dbType]
+async function onTest(dbType, id) {
+  const conn = (presets.value[dbType] || []).find((c) => c.id === id)
   if (!conn) {
-    ElMessage.warning(`${dbType} 预设不存在`)
+    ElMessage.warning(`连接不存在：${dbType}::${id}`)
     return
   }
-  testing.value = dbType
+  testing.value = `${dbType}::${id}`
   try {
     const r = await fetch('/api/connect/test', {
       method: 'POST',
       headers: { 'Content-Type': 'application/json' },
       body: JSON.stringify({
-        // db_type 用参数（永远有值），不从 conn 取（API YAML 没这字段）
         db_type: dbType,
         host: conn.host,
         port: conn.port,
@@ -152,7 +196,7 @@ async function onTest(dbType) {
         : (detail.detail || JSON.stringify(detail))
       ElMessageBox.alert(
         `HTTP ${r.status}\n\n${detailMsg}`,
-        `❌ 测试失败（${dbType}）`,
+        `❌ 测试失败（${conn.display || conn.id}）`,
         { confirmButtonText: '好的', type: 'error' },
       )
       return
@@ -162,20 +206,20 @@ async function onTest(dbType) {
     if (data.ok) {
       ElMessageBox.alert(
         data.message || '连接成功',
-        `✅ ${dbType} 测试通过`,
+        `✅ ${conn.display || conn.id} 测试通过`,
         { confirmButtonText: '好的', type: 'success' },
       )
     } else {
       ElMessageBox.alert(
         data.message || '后端返回 ok=false 但无 message',
-        `❌ ${dbType} 测试失败`,
+        `❌ ${conn.display || conn.id} 测试失败`,
         { confirmButtonText: '好的', type: 'error' },
       )
     }
   } catch (e) {
     ElMessageBox.alert(
       `请求失败: ${e.message}`,
-      `❌ ${dbType} 网络错误`,
+      `❌ ${conn.display || conn.id} 网络错误`,
       { confirmButtonText: '好的', type: 'error' },
     )
   } finally {
@@ -183,11 +227,16 @@ async function onTest(dbType) {
   }
 }
 
-/** 切换当前连接到指定 db_type */
-function onSwitch(dbType) {
-  if (dbType === state.currentType) return
-  setDbType(dbType)
-  const label = dbTypes.find((d) => d.value === dbType)?.label || dbType
+/** 切换当前连接到指定 {db_type, id} */
+function onSwitch(dbType, id) {
+  if (isCurrent(dbType, id)) return
+  const ok = setCurrentConnection(dbType, id)
+  if (!ok) {
+    ElMessage.warning(`连接不存在：${dbType}::${id}`)
+    return
+  }
+  const conn = (presets.value[dbType] || []).find((c) => c.id === id)
+  const label = conn?.display || conn?.id || `${dbType}::${id}`
   ElMessage.success(`已切换到 ${label}`)
   document.activeElement?.blur?.()
 }
@@ -225,10 +274,48 @@ function onSwitch(dbType) {
   color: #409eff;
 }
 
+.db-popover__empty {
+  padding: 16px;
+  text-align: center;
+  color: #909399;
+  font-size: 13px;
+}
+
+/* 分组：每个 db_type 一组 */
+.db-popover__group {
+  margin-bottom: 10px;
+}
+.db-popover__group:last-child {
+  margin-bottom: 0;
+}
+.db-popover__group-head {
+  display: flex;
+  align-items: center;
+  gap: 6px;
+  padding: 4px 4px 4px 0;
+  font-size: 12px;
+  color: #909399;
+  font-weight: 600;
+  text-transform: uppercase;
+  letter-spacing: 0.5px;
+}
+.db-popover__group-name {
+  flex: 1;
+}
+.db-popover__group-count {
+  background: #f0f2f5;
+  color: #606266;
+  padding: 0 6px;
+  border-radius: 8px;
+  font-size: 11px;
+  font-weight: 500;
+  line-height: 16px;
+}
+
 /* 列表 */
 .db-popover__list {
   list-style: none;
-  margin: 0;
+  margin: 4px 0 0;
   padding: 0;
 }
 .db-popover__item {
@@ -239,6 +326,7 @@ function onSwitch(dbType) {
   border-radius: 6px;
   transition: background 0.15s;
   cursor: default;
+  gap: 6px;
 }
 .db-popover__item:hover {
   background: #f5f7fa;
@@ -246,19 +334,19 @@ function onSwitch(dbType) {
 .db-popover__item.is-active {
   background: #ecf5ff;
 }
-.db-popover__item.is-active .db-popover__name {
+.db-popover__item.is-active .db-popover__conn-name {
   color: #409eff;
   font-weight: 600;
 }
 
-/* logo + 数据库名（一行） */
-.db-popover__brand {
-  display: flex;
-  align-items: center;
-  gap: 8px;
-  flex: 1;
-  min-width: 0;
+.db-popover__none {
+  padding: 4px 10px;
+  color: #c0c4cc;
+  font-size: 12px;
+  font-style: italic;
 }
+
+/* logo */
 .db-popover__logo {
   width: 20px;
   height: 20px;
@@ -271,17 +359,31 @@ function onSwitch(dbType) {
   justify-content: center;
   border-radius: 4px;
   color: #fff;
-  font-size: 12px;
+  font-size: 11px;
 }
 .db-popover__logo--fallback .el-icon {
   font-size: 14px;
 }
-.db-popover__name {
+
+/* 连接信息：两行（名字 + host:port） */
+.db-popover__conn {
+  flex: 1;
+  min-width: 0;
+}
+.db-popover__conn-name {
   font-size: 14px;
   color: #303133;
   overflow: hidden;
   text-overflow: ellipsis;
   white-space: nowrap;
+  line-height: 1.3;
+}
+.db-popover__conn-host {
+  font-size: 11px;
+  color: #909399;
+  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
+  line-height: 1.3;
+  margin-top: 2px;
 }
 
 /* 操作按钮 */
@@ -293,4 +395,4 @@ function onSwitch(dbType) {
 .db-popover__actions .el-icon {
   font-size: 16px;
 }
-</style>
+</style>
\ No newline at end of file

web2/src/views/IdCardTool.vue

@@ -70,14 +70,14 @@
             type="primary"
             :icon="Search"
             :loading="querying"
-            :disabled="!state.currentType"
+            :disabled="!currentConnection?.host"
             @click="onQuery"
           >
             查询
           </el-button>
           <el-button text @click="onReset">重置</el-button>
         </el-form-item>
-        <el-form-item v-if="!state.currentType">
+        <el-form-item v-if="!currentConnection?.host">
           <span class="idcard-page__hint">
             <el-icon><Warning /></el-icon>
             请先在右上角选择数据库连接
@@ -368,7 +368,7 @@ async function onQuery() {
     return
   }
   const conn = currentConnection.value
-  if (!conn || !state.currentType) {
+  if (!conn || !conn.host) {
     ElMessage.warning('请先在右上角选择数据库连接')
     return
   }
@@ -392,7 +392,8 @@ async function onQuery() {
       method: 'POST',
       headers: { 'Content-Type': 'application/json' },
       body: JSON.stringify({
-        db_type: state.currentType,
+        // conn 里已含 db_type（store 从预设 / 后端注入），直接用
+        db_type: conn.db_type,
         host: conn.host,
         port: conn.port,
         user: conn.user,