TTS: configurable auth, Health check, Phoenix options; .env.example; Gitea CI workflow

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/main.go

@@ -55,9 +55,9 @@ func main() {
 	// Initialize services
 	sessionManager := session.NewManager(db, redisClient)
 
-	// Initialize ASR/TTS (using mocks for now)
+	// Initialize ASR/TTS
 	asrService := asr.NewMockASRService()
-	ttsService := tts.NewMockTTSService()
+	ttsService := newTTSService()
 
 	// Initialize LLM (using mock for now)
 	llmGateway := llm.NewMockLLMGateway()
@@ -128,6 +128,28 @@ func main() {
 	log.Println("Server exited")
 }
 
+// newTTSService returns a TTS service from env: use real API when TTS_API_KEY (or
+// ELEVENLABS_API_KEY) and TTS_VOICE_ID are set. Optional: TTS_BASE_URL (Phoenix),
+// TTS_AUTH_HEADER_NAME / TTS_AUTH_HEADER_VALUE (e.g. Authorization: Bearer),
+// USE_PHOENIX_TTS=true to require TTS_BASE_URL.
+func newTTSService() tts.Service {
+	apiKey := getEnv("TTS_API_KEY", os.Getenv("ELEVENLABS_API_KEY"))
+	voiceID := getEnv("TTS_VOICE_ID", os.Getenv("ELEVENLABS_VOICE_ID"))
+	baseURL := getEnv("TTS_BASE_URL", "")
+	authName := getEnv("TTS_AUTH_HEADER_NAME", "")
+	authValue := getEnv("TTS_AUTH_HEADER_VALUE", "")
+	usePhoenix := getEnv("USE_PHOENIX_TTS", "") == "true" || getEnv("USE_PHOENIX_TTS", "") == "1"
+	if usePhoenix && baseURL == "" {
+		baseURL = getEnv("PHOENIX_TTS_BASE_URL", "https://phoenix.example.com/tts/v1")
+	}
+	hasAuth := apiKey != "" || authValue != ""
+	if hasAuth && voiceID != "" {
+		opts := tts.TTSOptions{BaseURL: baseURL, AuthHeaderName: authName, AuthHeaderValue: authValue}
+		return tts.NewElevenLabsTTSServiceWithOptionsFull(apiKey, voiceID, opts)
+	}
+	return tts.NewMockTTSService()
+}
+
 func getEnv(key, defaultValue string) string {
 	if value := os.Getenv(key); value != "" {
 		return value