feat: enhance agent orchestration, knowledge flow and UI refinements

backend/app/schemas/settings.py

@@ -10,7 +10,8 @@ LLMType = Literal["chat", "vlm", "embedding", "rerank"]
 # 单个模型配置
 class LLMModelConfig(BaseModel):
     name: str = ""  # 模型名称/别名，用于标识
-    provider: LLMProviderType = "openai"
+    # provider 已废弃为必填字段：优先通过 base_url + model 推断。
+    provider: Optional[LLMProviderType] = None
     model: str = ""
     base_url: str = ""
     api_key: str = ""
@@ -52,7 +53,8 @@ class SettingsOut(BaseModel):
 # 测试 LLM 连接请求
 class LLMTestIn(BaseModel):
     type: LLMType
-    provider: LLMProviderType
+    # provider 已废弃为必填字段：优先通过 base_url + model 推断。
+    provider: Optional[LLMProviderType] = None
     model: str
     base_url: str
     api_key: str