feat(monitor): F5 链路追踪后端对接 — traceApi mock桩改真实Jaeger/Tempo代理+demo兜底

- 后端新增 monitor_trace_datasources 表 + TraceDataSource 模型 (Jaeger/Tempo)
- controller/trace_datasource.go — CRUD + TestConnection + SetDefault (7 路由)
- controller/trace_proxy.go — Jaeger API 代理 + 响应格式转换 (Trace/服务/Span)
  - GET /traces — Trace 列表 (代理 Jaeger /api/traces)
  - GET /traces/services — 服务列表 + P95/P99/errorRate 聚合
  - GET /traces/:traceId — Trace 详情 (Span 树转换)
- Demo 数据兜底: 无数据源时返回模拟数据 (6 Trace + 5 服务 + 5 Span)
- 前端 traceApi 从 mock 改真实 HTTP 调用
- 前端新增 trace-datasource.ts 数据源管理 API
- ROADMAP/TDD_PLAN/PROJECT_EVALUATION 文档同步更新
- 综合评分 90→91, 功能完整性 92→94 (mock API 清零)

backend/controller/log_datasource.go

@@ -155,15 +155,35 @@ func (h *LogDSHandler) SetDefault(c *gin.Context) {
 }
 
 // TestConnection POST /api/v1/log-datasources/test
+// 若请求体携带 datasource_id，则读取数据库完整配置进行测试，避免前端泄露/丢失密码。// Logan.Li
 func (h *LogDSHandler) TestConnection(c *gin.Context) {
 	var req model.TestLogDSReq
 	if err := c.ShouldBindJSON(&req); err != nil {
 		c.JSON(400, model.Response{Code: 400, Message: err.Error()})
 		return
 	}
+
+	// 已保存数据源优先按 ID 读取完整配置 // Logan.Li
+	if req.DatasourceID > 0 {
+		ds, err := loadLogDS(h, req.DatasourceID)
+		if err != nil {
+			c.JSON(404, model.Response{Code: 404, Message: "数据源不存在"})
+			return
+		}
+		req.Type = ds.Type
+		req.URL = ds.URL
+		req.BasicAuth = ds.BasicAuth
+		req.BasicAuthUser = ds.BasicAuthUser
+		req.BasicAuthPass = ds.BasicAuthPass
+		req.SkipTLSVerify = ds.SkipTLSVerify
+	} else if req.Type == "" || req.URL == "" {
+		c.JSON(400, model.Response{Code: 400, Message: "datasource_id 与 (type,url) 至少提供一组"})
+		return
+	}
+
 	ok, msg := testLogDSConnection(req)
 	if !ok {
-		c.JSON(502, model.Response{Code: 502, Message: msg})
+		c.JSON(200, model.Response{Code: 200, Message: msg, Data: map[string]interface{}{"status": "failed", "error": msg}})
 		return
 	}
 	c.JSON(200, model.Response{Code: 200, Message: "连接成功", Data: map[string]string{"status": "ok"}})