Initial commit: AI Video Assistant fullstack platform.

Add pipecat-based backend with WebRTC/WS voice routes, Next.js frontend, and Docker Compose orchestration.

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

backend/services/config_resolver.py

@@ -0,0 +1,64 @@
+"""assistant_id → 运行时配置(把真 key 在服务端组装好)。
+
+浏览器只传 assistant_id;真 key 在这里从 provider_credentials 取出注入。
+取不到凭证记录时,降级用 .env 默认值(开发期零配置仍能跑)。
+"""
+
+import config
+from db.models import Assistant, ProviderCredential
+from models import AssistantConfig
+from sqlalchemy import select
+from sqlalchemy.ext.asyncio import AsyncSession
+
+
+async def _get_credential(
+    session: AsyncSession, type_: str, name: str = ""
+) -> ProviderCredential | None:
+    """取某类(LLM/ASR/TTS)凭证:优先按资源名匹配,否则取该类默认。"""
+    stmt = select(ProviderCredential).where(ProviderCredential.type == type_)
+    if name:
+        # 助手按资源名引用(如 model="DeepSeek-V3");命中则用它
+        named = (
+            await session.execute(stmt.where(ProviderCredential.name == name).limit(1))
+        ).scalar_one_or_none()
+        if named:
+            return named
+    stmt = stmt.order_by(
+        ProviderCredential.is_default.desc(), ProviderCredential.id.asc()
+    ).limit(1)
+    return (await session.execute(stmt)).scalar_one_or_none()
+
+
+async def resolve_runtime_config(
+    session: AsyncSession, assistant_id: str
+) -> AssistantConfig:
+    """加载助手 + 解析凭证,产出可直接交给管线的运行时配置(含真 key)。
+
+    type 映射:LLM→大模型, ASR→语音识别, TTS→语音合成。
+    """
+    assistant = await session.get(Assistant, assistant_id)
+    if assistant is None:
+        raise ValueError(f"助手不存在: {assistant_id}")
+
+    llm = await _get_credential(session, "LLM", assistant.model)
+    stt = await _get_credential(session, "ASR", assistant.asr)
+    tts = await _get_credential(session, "TTS")
+
+    return AssistantConfig(
+        name=assistant.name,
+        greeting=assistant.greeting,
+        prompt=assistant.prompt,
+        runtimeMode=assistant.runtime_mode,  # type: ignore[arg-type]
+        enableInterrupt=assistant.enable_interrupt,
+        # 模型/音色:凭证的模型ID优先,否则助手里填的
+        model=(llm.model_id if llm else assistant.model),
+        asr=(stt.model_id if stt else assistant.asr),
+        voice=assistant.voice,
+        # 运行时连接信息(真 key + url):凭证优先,否则 .env 兜底
+        llm_api_key=(llm.api_key if llm else config.LLM_API_KEY),
+        llm_base_url=(llm.api_url if llm else config.LLM_BASE_URL),
+        stt_api_key=(stt.api_key if stt else config.STT_API_KEY),
+        stt_base_url=(stt.api_url if stt else config.STT_BASE_URL),
+        tts_api_key=(tts.api_key if tts else config.TTS_API_KEY),
+        tts_base_url=(tts.api_url if tts else config.TTS_BASE_URL),
+    )