feat(log): decouple log storage from ClickHouse with switchable logstore

- New internal/repository/logstore abstraction: exported domain interfaces
  (AccessLogStore/ObservabilityStore/UserAccessLogStore/StatusStore),
  config-driven provider (Active/Build/Migrating/SetConfigReader), GORM
  implementation for PostgreSQL/SQLite (incl. hourly rollups computed in
  real time, migration listers, PG partition maintenance), and a ClickHouse
  wrapper preserving the native batch path; repository facade delegates to
  logstore; import-lint test enforces apps never import analyticsrepo.
- ClickHouse is now optional: the log DB is either the main DB (postgres
  when database.enabled, else sqlite) or clickhouse; boot validation +
  first-run seed; log_database / log_db_migration are protected keys.
- New user task 切换日志数据库 (of_log_db_switch): freeze log writes,
  drain batch writers, copy all 6 raw log tables by id (preserving IDs)
  with target-partition pre-creation for PG, flip log_database on success,
  clear the freeze flag on failure.
- Per-store retention (log_retention_days_*) with expiry cleanup folded
  into the daily system_cleanup task; legacy database_auto_cleanup_* and
  of_database_auto_cleanup decommissioned.
- goose migrations: 6 log tables in PG (2 monthly-partitioned) + SQLite,
  retention config seeds, schedule cleanup; GET
  /api/v1/admin/status/log-database endpoint; frontend retention settings,
  switch-task UI and status badge; changelog and docs updated.

docs(plan): log database decoupling implementation plan

docs(design): log database decoupling design (ClickHouse optional)

internal/router/v1/admin.go

@@ -51,7 +51,7 @@ func RegisterAdminRoutes(apiV1Router *gin.RouterGroup) {
 func registerAdminDiagnosticRoutes(adminRouter *gin.RouterGroup) {
 	// System status
 	adminRouter.GET("/status", admin_status.GetSystemStatus)
-	adminRouter.GET("/status/clickhouse", admin_status.GetClickHouseStatus)
+	adminRouter.GET("/status/log-database", admin_status.GetLogDatabaseStatus)
 
 	// Database basic info & backup export
 	adminRouter.GET("/db-info", admin_status.GetDatabaseInfo)

internal/router/v1/openflare/register_option.go

@@ -19,7 +19,6 @@ func registerOptionRoutes(apiGroup *gin.RouterGroup) {
 		optionRoute.POST("/update", option.UpdateOptionHandler)
 		optionRoute.POST("/update-batch", option.UpdateOptionsBatchHandler)
 		optionRoute.POST("/geoip/lookup", option.LookupGeoIPHandler)
-		optionRoute.POST("/database/cleanup", option.CleanupDatabaseHandler)
 	}
 
 	uptimeKumaRoute := apiGroup.Group("/uptimekuma")