feat(api): add /auth/whoami endpoint for identity detection

cmd/server/main.go

@@ -203,6 +203,7 @@ func main() {
 	masterHandler := api.NewMasterHandler(db, logDB, masterService, syncService, statsService, logPartitioner)
 	internalHandler := api.NewInternalHandler(db)
 	featureHandler := api.NewFeatureHandler(rdb)
+	authHandler := api.NewAuthHandler(db, rdb, adminService, masterService)
 	modelRegistryService := service.NewModelRegistryService(db, rdb, service.ModelRegistryConfig{
 		Enabled:             cfg.ModelRegistry.Enabled,
 		RefreshEvery:        time.Duration(cfg.ModelRegistry.RefreshSeconds) * time.Second,
@@ -356,6 +357,12 @@ func main() {
 		masterGroup.GET("/stats", masterHandler.GetSelfStats)
 	}
 
+	// Auth Routes (public, no middleware - self-validates token)
+	authGroup := r.Group("/auth")
+	{
+		authGroup.GET("/whoami", authHandler.Whoami)
+	}
+
 	// Public/General Routes (if any)
 	r.POST("/logs", handler.IngestLog)