update llm.txt

backend/llm.txt

@@ -207,6 +207,7 @@ Generator will convert snake_case columns to Go struct field names (e.g. `class_
 - After creating/updating a service provider, regenerate wiring:
 - `atomctl gen service`
 - `atomctl gen provider`
+- Injection rule: provider injected dependencies MUST be `success`. do not add business-level fallbacks for injection objects nil check.
 - Service call conventions:
 - **Service-to-service (inside `services` package)**: call directly as `CamelCaseServiceStructName.Method()` (no `services.` prefix).
 - **From outside (controllers/handlers/etc.)**: call via the package entrypoint `services.CamelCaseServiceStructName.Method()`.