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/api/pages.py

@@ -1,3 +1,5 @@
+import json
+
 from fastapi import APIRouter, Request
 from fastapi.responses import HTMLResponse
 from fastapi.templating import Jinja2Templates
@@ -18,3 +20,19 @@ def dashboard(request: Request):
             "recent_packages": [],
         },
     )
+
+
+@router.get("/drivers", response_class=HTMLResponse)
+def drivers_page(request: Request):
+    from imptune.db.models import Driver
+
+    drivers = list(Driver.select().order_by(Driver.uploaded_at.desc()))
+    driver_data = []
+    for d in drivers:
+        names = json.loads(d.driver_desc) if d.driver_desc else []
+        driver_data.append({"driver": d, "names": names})
+    return templates.TemplateResponse(
+        request=request,
+        name="drivers.html",
+        context={"driver_data": driver_data},
+    )