feat(frontend): 新增多版本笔记功能，并做了向下兼容。

- 新增关于页面组件，介绍项目背景、功能和使用方法
- 重构笔记生成逻辑，支持多版本笔记
- 新增笔记版本选择、复制和导出功能
-优化笔记界面布局和交互
- 调整部分组件样式，提升用户体验

backend/app/services/provider.py

@@ -14,6 +14,7 @@ from app.models.model_config import ModelConfig
 
 
 class ProviderService:
+
     @staticmethod
     def serialize_provider(row: tuple) -> dict:
         if not row:
@@ -28,7 +29,25 @@ class ProviderService:
             "enabled": row[6],
             "created_at": row[7],
         }
-
+    @staticmethod
+    def serialize_provider_safe(row: tuple) -> dict:
+        if not row:
+            return None
+        return {
+            "id": row[0],
+            "name": row[1],
+            "logo": row[2],
+            "type": row[3],
+            "api_key": ProviderService.mask_key(row[4]),
+            "base_url": row[5],
+            "enabled": row[6],
+            "created_at": row[7],
+        }
+    @staticmethod
+    def mask_key(key: str) -> str:
+        if not key or len(key) < 8:
+            return '*' * len(key)
+        return key[:4] + '*' * (len(key) - 8) + key[-4:]
     @staticmethod
     def add_provider( name: str, api_key: str, base_url: str, logo: str, type_: str, enabled: int = 1):
         try:
@@ -42,7 +61,10 @@ class ProviderService:
     def get_all_providers():
         rows = get_all_providers()
         return [ProviderService.serialize_provider(row) for row in rows] if rows else []
-
+    @staticmethod
+    def get_all_providers_safe():
+        rows = get_all_providers()
+        return [ProviderService.serialize_provider(row) for row in rows] if rows else []
     @staticmethod
     def get_provider_by_name(name: str):
         row = get_provider_by_name(name)