feat: auto-create search/tts providers at startup with enable toggle

- Add `enable` column (default false) to search_providers and tts_providers tables
- Auto-create default entries for all provider types on startup (disabled by default)
- Add enable/disable Switch toggle in frontend for both search and TTS providers
- Show green status dot in sidebar for enabled providers, sort enabled first
- Filter bot settings dropdowns to only show enabled providers

cmd/memoh/serve.go

@@ -190,6 +190,8 @@ func runServe() {
 			injectToolProviders,
 			startRegistrySync,
 			startMemoryProviderBootstrap,
+			startSearchProviderBootstrap,
+			startTtsProviderBootstrap,
 			startScheduleService,
 			startHeartbeatService,
 			startChannelManager,
@@ -314,6 +316,28 @@ func startMemoryProviderBootstrap(lc fx.Lifecycle, log *slog.Logger, mpService *
 	})
 }
 
+func startTtsProviderBootstrap(lc fx.Lifecycle, log *slog.Logger, ttsService *ttspkg.Service) {
+	lc.Append(fx.Hook{
+		OnStart: func(ctx context.Context) error {
+			if err := ttsService.EnsureDefaults(ctx); err != nil {
+				log.Warn("failed to ensure default tts providers", slog.Any("error", err))
+			}
+			return nil
+		},
+	})
+}
+
+func startSearchProviderBootstrap(lc fx.Lifecycle, log *slog.Logger, spService *searchproviders.Service) {
+	lc.Append(fx.Hook{
+		OnStart: func(ctx context.Context) error {
+			if err := spService.EnsureDefaults(ctx); err != nil {
+				log.Warn("failed to ensure default search providers", slog.Any("error", err))
+			}
+			return nil
+		},
+	})
+}
+
 func provideRouteService(log *slog.Logger, queries *dbsqlc.Queries, chatService *conversation.Service) *route.DBService {
 	return route.NewService(log, queries, chatService)
 }