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)

frontend/app/(main)/admin/settings/components/openflare-ops-utils.ts

@@ -18,8 +18,6 @@ export type OpenFlareOpsFields = {
   uptime_kuma_retry: string;
   uptime_kuma_retry_interval: string;
   uptime_kuma_timeout: string;
-  database_auto_cleanup_enabled: boolean;
-  database_auto_cleanup_retention_days: string;
   pages_max_package_size_mb: string;
   pages_max_history_count: string;
 };
@@ -42,8 +40,6 @@ export const defaultOpenFlareOpsFields: OpenFlareOpsFields = {
   uptime_kuma_retry: '0',
   uptime_kuma_retry_interval: '60',
   uptime_kuma_timeout: '48',
-  database_auto_cleanup_enabled: false,
-  database_auto_cleanup_retention_days: '30',
   pages_max_package_size_mb: '100',
   pages_max_history_count: '20',
 };
@@ -88,12 +84,6 @@ export function mapOptionsToOpsFields(
     uptime_kuma_retry: optionMap.uptime_kuma_retry ?? '0',
     uptime_kuma_retry_interval: optionMap.uptime_kuma_retry_interval ?? '60',
     uptime_kuma_timeout: optionMap.uptime_kuma_timeout ?? '48',
-    database_auto_cleanup_enabled: toBoolean(
-      optionMap.database_auto_cleanup_enabled,
-      false,
-    ),
-    database_auto_cleanup_retention_days:
-      optionMap.database_auto_cleanup_retention_days ?? '30',
     pages_max_package_size_mb: optionMap.pages_max_package_size_mb ?? '100',
     pages_max_history_count: optionMap.pages_max_history_count ?? '20',
   };
@@ -165,16 +155,6 @@ export function validateUptimeKumaFields(fields: OpenFlareOpsFields) {
     throw new Error('请求超时必须为正整数。');
 }
 
-export function validateDatabaseAutoCleanup(fields: OpenFlareOpsFields) {
-  const retentionDays = Number.parseInt(
-    fields.database_auto_cleanup_retention_days,
-    10,
-  );
-  if (Number.isNaN(retentionDays) || retentionDays < 1) {
-    throw new Error('自动清理保留天数至少为 1 天。');
-  }
-}
-
 export function agentOptionEntries(fields: OpenFlareOpsFields): OptionItem[] {
   validateAgentFields(fields);
   return [
@@ -220,22 +200,6 @@ export function uptimeKumaOptionEntries(
   ];
 }
 
-export function databaseAutoCleanupEntries(
-  fields: OpenFlareOpsFields,
-): OptionItem[] {
-  validateDatabaseAutoCleanup(fields);
-  return [
-    {
-      key: 'database_auto_cleanup_enabled',
-      value: String(fields.database_auto_cleanup_enabled),
-    },
-    {
-      key: 'database_auto_cleanup_retention_days',
-      value: fields.database_auto_cleanup_retention_days,
-    },
-  ];
-}
-
 export function validatePagesFields(fields: OpenFlareOpsFields) {
   const packageSize = Number.parseInt(fields.pages_max_package_size_mb, 10);
   const historyCount = Number.parseInt(fields.pages_max_history_count, 10);