Initial commit: clean project structure

- Backend: FastAPI + SQLAlchemy + Celery (Python 3.11+)
- Frontend: Vue 3 + TypeScript + Pinia + Tailwind
- Admin Frontend: separate Vue 3 app for management
- Docker Compose: 9 services orchestration
- Specs: design prototypes, memory system PRD, product roadmap

Cleanup performed:
- Removed temporary debug scripts from backend root
- Removed deprecated admin_app.py (embedded UI)
- Removed duplicate docs from admin-frontend
- Updated .gitignore for Vite cache and egg-info

backend/app/services/adapters/tts/elevenlabs.py

@@ -0,0 +1,104 @@
+"""ElevenLabs TTS 语音合成适配器。"""
+
+import time
+
+import httpx
+from tenacity import (
+    retry,
+    retry_if_exception_type,
+    stop_after_attempt,
+    wait_exponential,
+)
+
+from app.core.logging import get_logger
+from app.services.adapters.base import AdapterConfig, BaseAdapter
+from app.services.adapters.registry import AdapterRegistry
+
+logger = get_logger(__name__)
+
+ELEVENLABS_API_BASE = "https://api.elevenlabs.io/v1"
+DEFAULT_VOICE_ID = "21m00Tcm4TlvDq8ikWAM"  # Rachel
+
+
+@AdapterRegistry.register("tts", "elevenlabs")
+class ElevenLabsTtsAdapter(BaseAdapter[bytes]):
+    """ElevenLabs TTS 语音合成适配器，返回 MP3 bytes。"""
+
+    adapter_type = "tts"
+    adapter_name = "elevenlabs"
+
+    def __init__(self, config: AdapterConfig):
+        super().__init__(config)
+        self.api_base = config.api_base or ELEVENLABS_API_BASE
+
+    async def execute(self, text: str, **kwargs) -> bytes:
+        """将文本转换为语音 MP3 bytes。"""
+        start_time = time.time()
+        logger.info("elevenlabs_tts_start", text_length=len(text))
+
+        voice_id = kwargs.get("voice_id") or DEFAULT_VOICE_ID
+        model_id = kwargs.get("model") or self.config.model or "eleven_multilingual_v2"
+        stability = kwargs.get("stability", 0.5)
+        similarity_boost = kwargs.get("similarity_boost", 0.75)
+
+        url = f"{self.api_base}/text-to-speech/{voice_id}"
+
+        payload = {
+            "text": text,
+            "model_id": model_id,
+            "voice_settings": {
+                "stability": stability,
+                "similarity_boost": similarity_boost,
+            },
+        }
+
+        audio_bytes = await self._call_api(url, payload)
+
+        elapsed = time.time() - start_time
+        logger.info(
+            "elevenlabs_tts_success",
+            elapsed_seconds=round(elapsed, 2),
+            audio_size_bytes=len(audio_bytes),
+        )
+
+        return audio_bytes
+
+    async def health_check(self) -> bool:
+        """检查 ElevenLabs API 是否可用。"""
+        try:
+            async with httpx.AsyncClient(timeout=10) as client:
+                response = await client.get(
+                    f"{self.api_base}/voices",
+                    headers={"xi-api-key": self.config.api_key},
+                )
+                return response.status_code == 200
+        except Exception:
+            return False
+
+    @property
+    def estimated_cost(self) -> float:
+        """预估每千字符成本 (USD)。"""
+        return 0.03
+
+    @retry(
+        stop=stop_after_attempt(3),
+        wait=wait_exponential(multiplier=1, min=1, max=10),
+        retry=retry_if_exception_type((httpx.HTTPError, httpx.TimeoutException)),
+        reraise=True,
+    )
+    async def _call_api(self, url: str, payload: dict) -> bytes:
+        """调用 ElevenLabs API，带重试机制。"""
+        timeout = self.config.timeout_ms / 1000
+
+        async with httpx.AsyncClient(timeout=timeout) as client:
+            response = await client.post(
+                url,
+                json=payload,
+                headers={
+                    "xi-api-key": self.config.api_key,
+                    "Content-Type": "application/json",
+                    "Accept": "audio/mpeg",
+                },
+            )
+            response.raise_for_status()
+            return response.content