:feat 新增模型配置页面和相关功能

- 新增模型配置页面组件和路由
- 实现模型配置表单和相关逻辑- 添加全局配置入口和功能- 优化首页布局和样式- 新增 404 页面组件
- 更新部分组件样式和结构

backend/app/routers/provider.py

@@ -0,0 +1,82 @@
+from typing import Optional
+from fastapi import APIRouter
+from pydantic import BaseModel
+from app.utils.response import ResponseWrapper as R
+from app.services.provider import ProviderService
+
+router = APIRouter()
+
+# ✅ 新增 type 字段
+class ProviderRequest(BaseModel):
+    name: str
+    api_key: str
+    base_url: str
+    logo: str
+    type: str
+
+class ProviderUpdateRequest(BaseModel):
+    id: int
+    name: Optional[str] = None
+    api_key: Optional[str] = None
+    base_url: Optional[str] = None
+    logo: Optional[str] = None
+    type: Optional[str] = None
+
+@router.post("/add_provider")
+def add_provider(data: ProviderRequest):
+    try:
+        ProviderService.add_provider(
+            name=data.name,
+            api_key=data.api_key,
+            base_url=data.base_url,
+            logo=data.logo,
+            type_=data.type
+        )
+        return R.success(msg='添加模型供应商成功')
+    except Exception as e:
+        return R.error(msg=e)
+
+@router.get("/get_all_providers")
+def get_all_providers():
+    try:
+        res = ProviderService.get_all_providers()
+        return R.success(data=res)
+    except Exception as e:
+        return R.error(msg=e)
+
+@router.get("/get_provider_by_id/{id}")
+def get_provider_by_id(id: int):
+    try:
+        res = ProviderService.get_provider_by_id(id)
+        return R.success(data=res)
+    except Exception as e:
+        return R.error(msg=e)
+
+@router.get("/get_provider_by_name/{name}")
+def get_provider_by_name(name: str):
+    try:
+        res = ProviderService.get_provider_by_name(name)
+        return R.success(data=res)
+    except Exception as e:
+        return R.error(msg=e)
+
+@router.post("/update_provider/")
+def update_provider(data: ProviderUpdateRequest):
+    try:
+        if all(
+            field is None
+            for field in [data.name, data.api_key, data.base_url, data.logo, data.type]
+        ):
+            return R.error(msg='请至少填写一个参数')
+
+        ProviderService.update_provider(
+            id=data.id,
+            name=data.name or '',
+            api_key=data.api_key or '',
+            base_url=data.base_url or '',
+            logo=data.logo or '',
+            type_=data.type or ''
+        )
+        return R.success(msg='更新模型供应商成功')
+    except Exception as e:
+        return R.error(msg=e)