feat: Stage 2 — authentication and setup flow

Backend (tasks 2.1–2.6, 2.10):
- settings_repo: get/set/delete/get_all CRUD for the key-value settings table
- session_repo: create/get/delete/delete_expired for session rows
- setup_service: bcrypt password hashing, one-time-only enforcement,
  run_setup() / is_setup_complete() / get_password_hash()
- auth_service: login() with bcrypt verify + token creation,
  validate_session() with expiry check, logout()
- setup router: GET /api/setup (status), POST /api/setup (201 / 409)
- auth router: POST /api/auth/login (token + HttpOnly cookie),
               POST /api/auth/logout (clears cookie, idempotent)
- SetupRedirectMiddleware: 307 → /api/setup for all API paths until setup done
- require_auth dependency: cookie or Bearer token → Session or 401
- conftest.py: manually bootstraps app.state.db for router tests
  (ASGITransport does not trigger ASGI lifespan)
- 85 tests pass; ruff 0 errors; mypy --strict 0 errors

Frontend (tasks 2.7–2.9):
- types/auth.ts, types/setup.ts, api/auth.ts, api/setup.ts
- AuthProvider: sessionStorage-backed context (isAuthenticated, login, logout)
- RequireAuth: guard component → /login?next=<path> when unauthenticated
- SetupPage: Fluent UI form, client-side validation, inline errors
- LoginPage: single password input, ?next= redirect after success
- DashboardPage: placeholder (full impl Stage 5)
- App.tsx: full route tree (/setup, /login, /, *)

backend/pyproject.toml

@@ -42,7 +42,10 @@ select = ["E", "F", "W", "I", "N", "UP", "B", "C4", "SIM", "TCH"]
 ignore = ["B008"]  # FastAPI uses function calls in default arguments (Depends)
 
 [tool.ruff.lint.per-file-ignores]
-"tests/**" = ["E402"]  # sys.path manipulation before imports is intentional in test helpers
+# sys.path manipulation before stdlib imports is intentional in test helpers
+# pytest evaluates fixture type annotations at runtime, so TC002/TC003 are false-positives
+"tests/**" = ["E402", "TC002", "TC003"]
+"app/routers/**" = ["TC001"]  # FastAPI evaluates Depends() type aliases at runtime via get_type_hints()
 
 [tool.ruff.format]
 quote-style = "double"