Add dynamic variable support to Assistant model and related components

- Introduce dynamic variable definitions in AssistantConfig and Assistant models, allowing for flexible prompt customization.
- Implement validation for dynamic variable names and types in the schema.
- Update backend services and routes to handle dynamic variables in assistant configurations and runtime processing.
- Enhance frontend components to support dynamic variable definitions, including a new editor for managing variables.
- Add tests to ensure proper functionality and validation of dynamic variables in various scenarios.

backend/routes/voice_webrtc.py

@@ -16,6 +16,7 @@ from loguru import logger
 from models import AssistantConfig, SignalingOffer
 from services.auth import require_admin, require_admin_websocket
 from services.config_resolver import resolve_runtime_config
+from services.runtime_variables import DynamicVariableError, prepare_dynamic_config
 from starlette.websockets import WebSocketDisconnect, WebSocketState
 
 from services.webrtc_ice import aiortc_ice_servers, client_ice_servers
@@ -52,7 +53,11 @@ async def voice_signaling(websocket: WebSocket):
                         {
                             "type": "error",
                             "payload": {
-                                "message": f"语音会话启动失败: {type(e).__name__}"
+                                "message": (
+                                    str(e)
+                                    if isinstance(e, DynamicVariableError)
+                                    else f"语音会话启动失败: {type(e).__name__}"
+                                )
                             },
                         }
                     )
@@ -71,9 +76,18 @@ async def _resolve_config(offer: SignalingOffer) -> AssistantConfig:
     """优先用 assistant_id 从 DB 解析(含真 key);否则用调试内联配置。"""
     if offer.assistant_id:
         async with SessionLocal() as session:
-            return await resolve_runtime_config(session, offer.assistant_id)
+            cfg = await resolve_runtime_config(session, offer.assistant_id)
+        return prepare_dynamic_config(
+            cfg,
+            offer.dynamic_variables,
+            assistant_id=offer.assistant_id,
+        )
     if offer.inline_config:
-        return offer.inline_config
+        return prepare_dynamic_config(
+            offer.inline_config,
+            offer.dynamic_variables,
+            assistant_id=None,
+        )
     raise ValueError("offer 缺少 assistant_id 或 inline_config")