ci: add mypy job + pre-commit hook, tighten type annotations

- .github/workflows/ci.yml: new 'types' job runs mypy src/; docker now needs lint+types+test
- .pre-commit-config.yaml: add mirrors-mypy hook on src/ with types-requests, types-PyYAML
- pyproject.toml: add per-module overrides ignoring legacy modules (main, downloader, reddit_client, database, extractors.{reddit,gfycat}) while keeping src/web/ strict
- src/web/deps.py: type DOWNLOADS_DIR explicitly as Path
- src/web/config_manager.py: type guards on get_subreddits/users/blacklist returns
- src/web/routers/favorites.py: dict[str, object] for result, avoid in-place + on object
- src/web/routers/media.py: dict[str, object] for delete result
- src/web/rate_limit.py: move Awaitable/Callable under TYPE_CHECKING
- ruff format + auto-fix on src/ + tests/

.github/workflows/ci.yml

@@ -15,8 +15,18 @@ jobs:
         with:
           python-version: "3.12"
       - run: pip install ruff
-      - run: ruff check src/
-      - run: ruff format --check src/
+      - run: ruff check src/ tests/
+      - run: ruff format --check src/ tests/
+
+  types:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+      - run: pip install -e ".[dev]"
+      - run: mypy src/
 
   test:
     runs-on: ubuntu-latest
@@ -30,7 +40,7 @@ jobs:
 
   docker:
     runs-on: ubuntu-latest
-    needs: [lint, test]
+    needs: [lint, types, test]
     steps:
       - uses: actions/checkout@v4
       - run: docker build -t reddit-media-collector .