refactor(global-model): migrate model metadata to flexible config structure

将模型配置从多个固定字段（description, official_url, icon_url, default_supports_* 等）
统一为灵活的 config JSON 字段，提高扩展性。同时优化前端模型创建表单，支持从 models-dev
列表直接选择模型快速填充。

主要变更：
- 后端：模型表迁移，支持 config JSON 存储模型能力和元信息
- 前端：GlobalModelFormDialog 支持两种创建方式（列表选择/手动填写）
- API 类型更新，对齐新的数据结构

src/services/cache/model_cache.py

@@ -385,7 +385,7 @@ class ModelCacheService:
             "is_active": model.is_active,
             "is_available": model.is_available if hasattr(model, "is_available") else True,
             "price_per_request": (
-                float(model.price_per_request) if model.price_per_request else None
+                float(model.price_per_request) if model.price_per_request is not None else None
             ),
             "tiered_pricing": model.tiered_pricing,
             "supports_vision": model.supports_vision,
@@ -425,14 +425,15 @@ class ModelCacheService:
             "id": global_model.id,
             "name": global_model.name,
             "display_name": global_model.display_name,
-            "default_supports_vision": global_model.default_supports_vision,
-            "default_supports_function_calling": global_model.default_supports_function_calling,
-            "default_supports_streaming": global_model.default_supports_streaming,
-            "default_supports_extended_thinking": global_model.default_supports_extended_thinking,
-            "default_supports_image_generation": global_model.default_supports_image_generation,
             "supported_capabilities": global_model.supported_capabilities,
+            "config": global_model.config,
+            "default_tiered_pricing": global_model.default_tiered_pricing,
+            "default_price_per_request": (
+                float(global_model.default_price_per_request)
+                if global_model.default_price_per_request is not None
+                else None
+            ),
             "is_active": global_model.is_active,
-            "description": global_model.description,
         }
 
     @staticmethod
@@ -442,19 +443,10 @@ class ModelCacheService:
             id=global_model_dict["id"],
             name=global_model_dict["name"],
             display_name=global_model_dict.get("display_name"),
-            default_supports_vision=global_model_dict.get("default_supports_vision", False),
-            default_supports_function_calling=global_model_dict.get(
-                "default_supports_function_calling", False
-            ),
-            default_supports_streaming=global_model_dict.get("default_supports_streaming", True),
-            default_supports_extended_thinking=global_model_dict.get(
-                "default_supports_extended_thinking", False
-            ),
-            default_supports_image_generation=global_model_dict.get(
-                "default_supports_image_generation", False
-            ),
             supported_capabilities=global_model_dict.get("supported_capabilities") or [],
+            config=global_model_dict.get("config"),
+            default_tiered_pricing=global_model_dict.get("default_tiered_pricing"),
+            default_price_per_request=global_model_dict.get("default_price_per_request"),
             is_active=global_model_dict.get("is_active", True),
-            description=global_model_dict.get("description"),
         )
         return global_model

src/services/model/global_model.py

@@ -62,7 +62,6 @@ class GlobalModelService:
             query = query.filter(
                 (GlobalModel.name.ilike(search_pattern))
                 | (GlobalModel.display_name.ilike(search_pattern))
-                | (GlobalModel.description.ilike(search_pattern))
             )
 
         # 按名称排序
@@ -75,21 +74,15 @@ class GlobalModelService:
         db: Session,
         name: str,
         display_name: str,
-        description: Optional[str] = None,
-        official_url: Optional[str] = None,
-        icon_url: Optional[str] = None,
         is_active: Optional[bool] = True,
         # 按次计费配置
         default_price_per_request: Optional[float] = None,
         # 阶梯计费配置（必填）
         default_tiered_pricing: dict = None,
-        # 默认能力配置
-        default_supports_vision: Optional[bool] = None,
-        default_supports_function_calling: Optional[bool] = None,
-        default_supports_streaming: Optional[bool] = None,
-        default_supports_extended_thinking: Optional[bool] = None,
         # Key 能力配置
         supported_capabilities: Optional[List[str]] = None,
+        # 模型配置（JSON）
+        config: Optional[dict] = None,
     ) -> GlobalModel:
         """创建 GlobalModel"""
         # 检查名称是否已存在
@@ -100,21 +93,15 @@ class GlobalModelService:
         global_model = GlobalModel(
             name=name,
             display_name=display_name,
-            description=description,
-            official_url=official_url,
-            icon_url=icon_url,
             is_active=is_active,
             # 按次计费配置
             default_price_per_request=default_price_per_request,
             # 阶梯计费配置
             default_tiered_pricing=default_tiered_pricing,
-            # 默认能力配置
-            default_supports_vision=default_supports_vision,
-            default_supports_function_calling=default_supports_function_calling,
-            default_supports_streaming=default_supports_streaming,
-            default_supports_extended_thinking=default_supports_extended_thinking,
             # Key 能力配置
             supported_capabilities=supported_capabilities,
+            # 模型配置（JSON）
+            config=config,
         )
 
         db.add(global_model)