feat(02-02): add driver upload endpoint with INF parsing and dedup

- POST /drivers/upload: validates ZIP, parses INF, persists via DriverStore + Peewee
- SHA256 dedup: get_or_create prevents duplicate Driver records
- GET /drivers route added to pages.py with driver_data context
- drivers.router registered in main.py
- drivers.html template with HTMX upload form
- partials/driver_list.html HTMX target with select dropdown and unused-file notice
- Fixed conftest client fixture to use context manager (triggers lifespan/init_db)
- [Rule 3] conftest: TestClient context manager required for lifespan trigger
- [Rule 1] drivers.py: dynamic DRIVERS_DIR read so monkeypatch works in tests

imptune/main.py

@@ -5,7 +5,7 @@ from pathlib import Path
 from fastapi import FastAPI
 from fastapi.staticfiles import StaticFiles
 
-from imptune.api import health, pages
+from imptune.api import drivers, health, pages
 from imptune.config import DATA_DIR, DRIVERS_DIR
 from imptune.db.database import init_db
 
@@ -27,3 +27,4 @@ app.mount("/static", StaticFiles(directory=str(_static_dir)), name="static")
 # Register routers
 app.include_router(health.router)
 app.include_router(pages.router)
+app.include_router(drivers.router)