feat(llm): 更新开发规则，添加关于DTO和分页响应的JSON标签要求

backend/llm.txt

@@ -8,6 +8,9 @@ This file condenses `backend/docs/dev/http_api.md` + `backend/docs/dev/model.md`
 
 - DO follow existing module layout under `backend/app/http/<module>/`.
 - MUST: HTTP module folder name MUST be `snake_case` (e.g. `tenant_public`), not `camelCase`/`mixedCase`.
+- MUST: JSON tags in DTOs and all response/request structs MUST use `snake_case` (e.g., `json:"user_id"`), never `camelCase` (e.g., `json:"userId"`).
+- MUST: Paginated list endpoints MUST return `*requests.Pager` and use the shared `requests.Pagination` types defined in `backend/app/requests/pagination.go`; DO NOT redefine pagination or pager structs in local DTOs.
+- MUST: The JSON response for paginated data MUST follow the `requests.Pager` layout: `{ "page": 1, "limit": 10, "total": 100, "items": [...] }`.
 - DO keep controller methods thin: parse/bind → call `services.*` → return result/error.
 - DO regenerate code after changes (routes/docs/models).
 - MUST: in `backend/app/services`, prefer the generated GORM-Gen DAO (`backend/database/models/*`) for DB access; treat raw `*gorm.DB` usage as a last resort.
@@ -64,7 +67,7 @@ Place above the handler function:
 
 Common `@Success` patterns:
 
-- Paginated list: `requests.Pager{items=dto.Item}`
+- Paginated list: `requests.Pager{items=[]dto.Item}`
 - Single object: `dto.Item`
 - Array: `{array} dto.Item`
 
@@ -205,7 +208,7 @@ In this case:
 ### Job（一次性任务）
 
 - `Kind() string`：任务类型标识（job kind）；改名会导致“新旧任务类型不一致”。
-- `InsertOpts() river.InsertOpts`：默认入队参数（队列、优先级、最大重试、唯一任务策略等）。
+- `InsertOpts() river.InsertOpts` : 默认入队参数（队列、优先级、最大重试、唯一任务策略等）。
 - `UniqueID() string`（项目约定）：周期任务 handle 的稳定 key；通常 `return Kind()`。
 
 ### Worker（执行器）
@@ -456,4 +459,4 @@ func (s *XxxTestSuite) Test_Method() {
 		So(got, ShouldBeNil)
 	})
 }
-```
+```