## 1. Backend User Config API

- [ ] 1.1 Create UserConfig SQLAlchemy model with JSONB config column
- [ ] 1.2 Create Alembic migration for UserConfig table
- [ ] 1.3 Add GET /users/me/config endpoint
- [ ] 1.4 Add PATCH /users/me/config endpoint with merge semantics
- [ ] 1.5 Add backend tests

## 2. Frontend Settings

- [ ] 2.1 Create settings API client (apps/web/src/api/settings.ts)
- [ ] 2.2 Create settings page with theme selector and git identity fields
- [ ] 2.3 Apply theme preference on app load in AppShell
- [ ] 2.4 Add /settings route to router

## 3. Verification

- [ ] 3.1 Run backend checks (ruff, mypy, pytest)
- [ ] 3.2 Run frontend checks (typecheck, lint, build)
- [ ] 3.3 Verify docker-compose config