新增配置管理功能及多存储支持

- 添加管理员端 API，用于获取和更新完整配置。
- 添加公共端 API，用于获取非敏感配置信息。
- 增加本地存储（LocalStorage）、S3（S3Storage）、和 WebDAV（WebDAVStorage）存储类型的实现。
- 支持热更新存储配置和保存配置文件至磁盘。
- 更新 Swagger 文档以包含新接口定义。

docs/swagger.yaml

@@ -59,6 +59,98 @@ definitions:
       status:
         type: string
     type: object
+  config.APITokenConfig:
+    properties:
+      allowAdminAPI:
+        type: boolean
+      enabled:
+        type: boolean
+      maxTokens:
+        type: integer
+    type: object
+  config.Config:
+    properties:
+      apitoken:
+        $ref: '#/definitions/config.APITokenConfig'
+      database:
+        $ref: '#/definitions/config.DatabaseConfig'
+      security:
+        $ref: '#/definitions/config.SecurityConfig'
+      site:
+        $ref: '#/definitions/config.SiteConfig'
+      storage:
+        $ref: '#/definitions/config.StorageConfig'
+      upload:
+        $ref: '#/definitions/config.UploadConfig'
+    type: object
+  config.DatabaseConfig:
+    properties:
+      path:
+        type: string
+    type: object
+  config.SecurityConfig:
+    properties:
+      adminPasswordHash:
+        type: string
+      jwtsecret:
+        type: string
+      pickupCodeLength:
+        type: integer
+      pickupFailLimit:
+        type: integer
+    type: object
+  config.SiteConfig:
+    properties:
+      description:
+        type: string
+      name:
+        type: string
+    type: object
+  config.StorageConfig:
+    properties:
+      local:
+        properties:
+          path:
+            type: string
+        type: object
+      s3:
+        properties:
+          accessKey:
+            type: string
+          bucket:
+            type: string
+          endpoint:
+            type: string
+          region:
+            type: string
+          secretKey:
+            type: string
+          useSSL:
+            type: boolean
+        type: object
+      type:
+        type: string
+      webDAV:
+        properties:
+          password:
+            type: string
+          root:
+            type: string
+          url:
+            type: string
+          username:
+            type: string
+        type: object
+    type: object
+  config.UploadConfig:
+    properties:
+      maxBatchFiles:
+        type: integer
+      maxFileSizeMB:
+        type: integer
+      maxRetentionDays:
+        type: integer
+    type: object
   model.APIToken:
     properties:
       created_at:
@@ -158,6 +250,18 @@ definitions:
       type:
         type: string
     type: object
+  public.PublicConfig:
+    properties:
+      api_token:
+        properties:
+          enabled:
+            type: boolean
+        type: object
+      site:
+        $ref: '#/definitions/config.SiteConfig'
+      upload:
+        $ref: '#/definitions/config.UploadConfig'
+    type: object
   public.UploadResponse:
     properties:
       batch_id:
@@ -440,6 +544,52 @@ paths:
       summary: 修改批次信息
       tags:
       - Admin
+  /admin/config:
+    get:
+      description: 获取系统的完整配置文件内容（仅管理员）
+      produces:
+      - application/json
+      responses:
+        "200":
+          description: OK
+          schema:
+            $ref: '#/definitions/config.Config'
+      security:
+      - AdminAuth: []
+      summary: 获取完整配置
+      tags:
+      - Admin
+    put:
+      consumes:
+      - application/json
+      description: 更新系统的配置文件内容（仅管理员）
+      parameters:
+      - description: 新配置内容
+        in: body
+        name: config
+        required: true
+        schema:
+          $ref: '#/definitions/config.Config'
+      produces:
+      - application/json
+      responses:
+        "200":
+          description: OK
+          schema:
+            $ref: '#/definitions/model.Response'
+        "400":
+          description: Bad Request
+          schema:
+            $ref: '#/definitions/model.Response'
+        "500":
+          description: Internal Server Error
+          schema:
+            $ref: '#/definitions/model.Response'
+      security:
+      - AdminAuth: []
+      summary: 更新配置
+      tags:
+      - Admin
   /admin/login:
     post:
       consumes:
@@ -607,6 +757,24 @@ paths:
       summary: 发送长文本
       tags:
       - Public
+  /api/config:
+    get:
+      description: 获取前端展示所需的非敏感配置数据
+      produces:
+      - application/json
+      responses:
+        "200":
+          description: OK
+          schema:
+            allOf:
+            - $ref: '#/definitions/model.Response'
+            - properties:
+                data:
+                  $ref: '#/definitions/public.PublicConfig'
+              type: object
+      summary: 获取公共配置
+      tags:
+      - Public
   /api/files/{file_id}/download:
     get:
       description: 根据文件 ID 下载单个文件