feat(llm): update

backend/llm.txt

@@ -156,6 +156,8 @@ Models live in:
 4) Map complex field types (JSON/ARRAY/UUID/…) via transform file:
 
 - `backend/database/.transform.yaml` → `field_type.<table>`
+- MUST: For ALL enum fields (even simple `VARCHAR`), you MUST map them to their corresponding Go enum type (defined in `backend/pkg/consts`) in `.transform.yaml`. This ensures strong typing in the generated models and avoids unsafe manual casting (e.g., `string(consts.GenderMale)`).
+- MUST: For deterministic JSONB fields (where the structure is known), define a corresponding Go struct in `backend/database/fields/` and map the field to `types.JSONType[fields.StructName]` in `.transform.yaml`.
 
 5) Generate models:
 
@@ -460,4 +462,4 @@ func (s *XxxTestSuite) Test_Method() {
 		So(got, ShouldBeNil)
 	})
 }
-```
+```