refactor: 全局适配 ApiFamily/EndpointKind 结构化标识体系

将新的 (ApiFamily, EndpointKind) / `family:kind` 签名体系应用到整个代码库：
- API Handlers: 所有 adapter/handler 使用新的签名格式
- Services: provider, model, usage, cache, auth 等服务层适配
- Database: ProviderEndpoint 新增 api_family/endpoint_kind 字段
- Frontend: Provider 管理、Usage 表格等组件适配
- Tests: 更新所有相关测试用例

src/services/email/email_sender.py

@@ -64,7 +64,9 @@ class EmailSenderService:
             "smtp_use_tls": SystemConfigService.get_config(db, "smtp_use_tls", default=True),
             "smtp_use_ssl": SystemConfigService.get_config(db, "smtp_use_ssl", default=False),
             "smtp_from_email": SystemConfigService.get_config(db, "smtp_from_email"),
-            "smtp_from_name": SystemConfigService.get_config(db, "smtp_from_name", default="Aether"),
+            "smtp_from_name": SystemConfigService.get_config(
+                db, "smtp_from_name", default="Aether"
+            ),
         }
         return config
 
@@ -143,7 +145,11 @@ class EmailSenderService:
 
         # 发送邮件
         return await EmailSenderService._send_email(
-            config=config, to_email=to_email, subject=subject, html_body=html_body, text_body=text_body
+            config=config,
+            to_email=to_email,
+            subject=subject,
+            html_body=html_body,
+            text_body=text_body,
         )
 
     @staticmethod

src/services/email/email_template.py

@@ -419,9 +419,7 @@ class EmailTemplate:
         return EmailTemplate.html_to_text(html)
 
     @staticmethod
-    def get_subject(
-        template_type: str = "verification", db: Session | None = None
-    ) -> str:
+    def get_subject(template_type: str = "verification", db: Session | None = None) -> str:
         """
         获取邮件主题