feat: 添加 points_audit_ledger 及 JSON 字段 Pydantic Schema 约束

backend/tests/AGENTS.md

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+# Backend Tests Rules
+
+This file governs `backend/tests/**` only.
+
+## Scope & Precedence
+
+- Inherits root `AGENTS.md` and `backend/AGENTS.md`.
+- If rules conflict, apply the stricter one.
+
+## Test Execution
+
+- Use `uv run pytest ...` for all backend test commands.
+- Unit tests should not depend on a running web process.
+- Integration tests under `backend/tests/integration` are live API tests and must run against a started backend.
+
+## Integration Tests (Required Precondition)
+
+- Before running integration tests, start backend and workers with:
+  - `./infra/scripts/app.sh restart`
+- Verify service readiness via `/health` before sending test requests.
+- Integration tests may write test data to database, but must clean up created records after each test.
+
+## Data Safety
+
+- Test data must use isolated identifiers (unique email suffix, unique run_id/thread_id).
+- Cleanup must include auth users and related bonus/audit records created by the test.
+- Never hardcode production credentials or mutable shared user IDs in tests.