feat(tts): add test-connection endpoint, hot-reload support, and Telegram voice messages

- Add POST /v1/tts/test-connection for testing TTS credentials before saving
- Add UpdateManager() with RWMutex for thread-safe HTTP handler hot-reload
- Add sendVoice() for Telegram voice bubble support via audio_as_voice metadata
- Wire ttsHandler into gateway deps for config reload propagation

cmd/gateway_deps.go

@@ -9,6 +9,7 @@ import (
 	"github.com/nextlevelbuilder/goclaw/internal/config"
 	"github.com/nextlevelbuilder/goclaw/internal/eventbus"
 	"github.com/nextlevelbuilder/goclaw/internal/gateway"
+	httpapi "github.com/nextlevelbuilder/goclaw/internal/http"
 	"github.com/nextlevelbuilder/goclaw/internal/providers"
 	"github.com/nextlevelbuilder/goclaw/internal/skills"
 	"github.com/nextlevelbuilder/goclaw/internal/store"
@@ -34,5 +35,6 @@ type gatewayDeps struct {
 	workspace        string
 	dataDir          string
 	domainBus        eventbus.DomainEventBus
-	audioMgr         *audio.Manager // nil if TTS not configured; used by TTSHandler
+	audioMgr         *audio.Manager      // nil if TTS not configured; used by TTSHandler
+	ttsHandler       *httpapi.TTSHandler // nil if TTS not configured; for hot-reload
 }

cmd/gateway_http_wiring.go

@@ -255,6 +255,7 @@ func (d *gatewayDeps) wireHTTPHandlersOnServer(
 			ttsH.SetRateLimiter(rl.Allow)
 		}
 		d.server.SetTTSHandler(ttsH)
+		d.ttsHandler = ttsH // store for hot-reload
 	}
 
 	// Seed + apply builtin tool disables

cmd/gateway_lifecycle.go

@@ -103,6 +103,9 @@ func (d *gatewayDeps) runLifecycle(
 			return
 		}
 		deps.ttsTool.UpdateManager(newMgr)
+		if d.ttsHandler != nil {
+			d.ttsHandler.UpdateManager(newMgr)
+		}
 		slog.Info("tts config reloaded", "provider", newMgr.PrimaryProvider(), "auto", string(newMgr.AutoMode()))
 	})