ci: add ruff linting and mypy type checking

Add ruff and mypy to dev dependencies with configuration in pyproject.toml.
Add a lint CI job that runs ruff check, ruff format --check, and mypy.
Auto-fix import sorting and formatting across the codebase. Exclude
alembic/versions from linting (auto-generated migrations). Ignore B008
(FastAPI Depends pattern) and RUF001 (unicode in user-facing strings).

21 ruff lint errors and 50 mypy errors remain for manual review.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/services/domains/runs/runs_service.py

@@ -35,9 +35,7 @@ async def list_runs_for_user(
         .limit(limit)
     )
     if failed_only:
-        stmt = stmt.where(
-            CrawlRun.status.in_([RunStatus.FAILED, RunStatus.PARTIAL_FAILURE])
-        )
+        stmt = stmt.where(CrawlRun.status.in_([RunStatus.FAILED, RunStatus.PARTIAL_FAILURE]))
     result = await db_session.execute(stmt)
     return list(result.scalars().all())