test(auth): port AUTH test plan docs + lint/format pass

- Port backend/docs/AUTH_TEST_PLAN.md and AUTH_UPGRADE.md from PR #1728
- Rename metadata.user_id → metadata.owner_id in AUTH_TEST_PLAN.md
  (4 occurrences from the original PR doc)
- ruff auto-fix UP037 in sentinel type annotations: drop quotes around
  "str | None | _AutoSentinel" now that from __future__ import
  annotations makes them implicit string forms
- ruff format: 2 files (app/gateway/app.py, runtime/user_context.py)

Note on test coverage additions:
- conftest.py autouse fixture was already added in commit 4 (had to
  be co-located with the repository changes to keep pre-existing
  persistence tests passing)
- cross-user isolation E2E tests (test_owner_isolation.py) deferred
  — enforcement is already proven by the 98-test repository suite
  via the autouse fixture + explicit _AUTO sentinel exercises
- New test cases (TC-API-17..20, TC-ATK-13, TC-MIG-01..07) listed
  in AUTH_TEST_PLAN.md are deferred to a follow-up PR — they are
  manual-QA test cases rather than pytest code, and the spec-level
  coverage is already met by test_user_context.py + the 98-test
  repository suite.

Final test results:
- Auth suite (test_auth*, test_langgraph_auth, test_ensure_admin,
  test_user_context): 186 passed
- Persistence suite (test_run_event_store, test_run_repository,
  test_thread_meta_repo, test_feedback): 98 passed
- Lint: ruff check + ruff format both clean

backend/packages/harness/deerflow/persistence/run/sql.py

@@ -69,7 +69,7 @@ class RunRepository(RunStore):
         *,
         thread_id,
         assistant_id=None,
-        owner_id: "str | None | _AutoSentinel" = AUTO,
+        owner_id: str | None | _AutoSentinel = AUTO,
         status="pending",
         multitask_strategy="reject",
         metadata=None,
@@ -102,7 +102,7 @@ class RunRepository(RunStore):
         self,
         run_id,
         *,
-        owner_id: "str | None | _AutoSentinel" = AUTO,
+        owner_id: str | None | _AutoSentinel = AUTO,
     ):
         resolved_owner_id = resolve_owner_id(owner_id, method_name="RunRepository.get")
         async with self._sf() as session:
@@ -117,7 +117,7 @@ class RunRepository(RunStore):
         self,
         thread_id,
         *,
-        owner_id: "str | None | _AutoSentinel" = AUTO,
+        owner_id: str | None | _AutoSentinel = AUTO,
         limit=100,
     ):
         resolved_owner_id = resolve_owner_id(owner_id, method_name="RunRepository.list_by_thread")
@@ -141,7 +141,7 @@ class RunRepository(RunStore):
         self,
         run_id,
         *,
-        owner_id: "str | None | _AutoSentinel" = AUTO,
+        owner_id: str | None | _AutoSentinel = AUTO,
     ):
         resolved_owner_id = resolve_owner_id(owner_id, method_name="RunRepository.delete")
         async with self._sf() as session: