feat: add tenant content management features for superadmin

- Implemented API endpoints for listing tenant contents and updating content status.
- Added Swagger documentation for new endpoints:
  - GET /super/v1/tenants/{tenantID}/contents
  - PATCH /super/v1/tenants/{tenantID}/contents/{contentID}/status
- Created DTOs for content item and status update form.
- Enhanced frontend to support content management in the tenant detail page.
- Added search and filter functionalities for tenant contents.
- Implemented unpublish functionality with confirmation dialog.
- Updated service layer to handle new content management logic.

backend/docs/swagger.yaml

@@ -704,6 +704,31 @@ definitions:
         description: Reason is the human-readable refund reason used for audit.
         type: string
     type: object
+  dto.SuperTenantContentItem:
+    properties:
+      content:
+        $ref: '#/definitions/models.Content'
+      owner:
+        $ref: '#/definitions/dto.SuperUserLite'
+      price:
+        $ref: '#/definitions/models.ContentPrice'
+      status_description:
+        type: string
+      visibility_description:
+        type: string
+    type: object
+  dto.SuperTenantContentStatusUpdateForm:
+    properties:
+      status:
+        allOf:
+        - $ref: '#/definitions/consts.ContentStatus'
+        description: 'Status supports: unpublished (下架) / blocked (封禁)'
+        enum:
+        - unpublished
+        - blocked
+    required:
+    - status
+    type: object
   dto.SuperTenantUserItem:
     properties:
       tenant_user:
@@ -1835,6 +1860,127 @@ paths:
       summary: 更新过期时间
       tags:
       - Super
+  /super/v1/tenants/{tenantID}/contents:
+    get:
+      consumes:
+      - application/json
+      parameters:
+      - description: TenantID
+        format: int64
+        in: path
+        name: tenantID
+        required: true
+        type: integer
+      - description: Asc specifies comma-separated field names to sort ascending by.
+        in: query
+        name: asc
+        type: string
+      - in: query
+        name: created_at_from
+        type: string
+      - in: query
+        name: created_at_to
+        type: string
+      - description: Desc specifies comma-separated field names to sort descending
+          by.
+        in: query
+        name: desc
+        type: string
+      - in: query
+        name: keyword
+        type: string
+      - description: Limit is page size; only values in {10,20,50,100} are accepted
+          (otherwise defaults to 10).
+        in: query
+        name: limit
+        type: integer
+      - description: Page is 1-based page index; values <= 0 are normalized to 1.
+        in: query
+        name: page
+        type: integer
+      - in: query
+        name: published_at_from
+        type: string
+      - in: query
+        name: published_at_to
+        type: string
+      - enum:
+        - draft
+        - reviewing
+        - published
+        - unpublished
+        - blocked
+        in: query
+        name: status
+        type: string
+        x-enum-varnames:
+        - ContentStatusDraft
+        - ContentStatusReviewing
+        - ContentStatusPublished
+        - ContentStatusUnpublished
+        - ContentStatusBlocked
+      - in: query
+        name: user_id
+        type: integer
+      - enum:
+        - public
+        - tenant_only
+        - private
+        in: query
+        name: visibility
+        type: string
+        x-enum-varnames:
+        - ContentVisibilityPublic
+        - ContentVisibilityTenantOnly
+        - ContentVisibilityPrivate
+      produces:
+      - application/json
+      responses:
+        "200":
+          description: OK
+          schema:
+            allOf:
+            - $ref: '#/definitions/requests.Pager'
+            - properties:
+                items:
+                  $ref: '#/definitions/dto.SuperTenantContentItem'
+              type: object
+      summary: 租户内容列表（平台侧）
+      tags:
+      - Super
+  /super/v1/tenants/{tenantID}/contents/{contentID}/status:
+    patch:
+      consumes:
+      - application/json
+      parameters:
+      - description: TenantID
+        format: int64
+        in: path
+        name: tenantID
+        required: true
+        type: integer
+      - description: ContentID
+        format: int64
+        in: path
+        name: contentID
+        required: true
+        type: integer
+      - description: Form
+        in: body
+        name: form
+        required: true
+        schema:
+          $ref: '#/definitions/dto.SuperTenantContentStatusUpdateForm'
+      produces:
+      - application/json
+      responses:
+        "200":
+          description: OK
+          schema:
+            $ref: '#/definitions/models.Content'
+      summary: 更新租户内容状态（平台侧：下架/封禁）
+      tags:
+      - Super
   /super/v1/tenants/{tenantID}/status:
     patch:
       consumes: