collect: migrate from weconnect to CarConnectivity + VW connector

Replace the weconnect library with carconnectivity and
carconnectivity-connector-volkswagen.  The connector is configured via
a dict passed to CarConnectivity(); startup()/fetch_all() replace
login()/update().  All domain extractors in data_model.py are rewritten
for the new object model (vehicle.charging.*, vehicle.get_electric_drive(),
vehicle.climatization.*, etc.).  Remaining time fields are now derived
from estimated_date_reached DateAttributes.  Battery temperatures are
read directly in °C (no Kelvin conversion).  Auth error handling drops
the manual re-login since the connector manages token refresh internally.

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

server/we_connect.py

@@ -2,35 +2,51 @@ import logging
 import sys
 
 try:
-    from weconnect import weconnect
+    from carconnectivity.carconnectivity import CarConnectivity
 except ImportError:
-    print("weconnect is not installed.  Run:  pip install weconnect", file=sys.stderr)
+    print(
+        "carconnectivity is not installed.  Run:  "
+        "pip install carconnectivity carconnectivity-connector-volkswagen",
+        file=sys.stderr,
+    )
     sys.exit(1)
 
 log = logging.getLogger(__name__)
 
 
-def connect(username: str, password: str):
-    wc = weconnect.WeConnect(
-        username=username,
-        password=password,
-        updateAfterLogin=False,
-        loginOnInit=True,
-    )
-    wc.login()
-    wc.update()
-    return wc
+def connect(username: str, password: str) -> CarConnectivity:
+    config = {
+        "carConnectivity": {
+            "connectors": [
+                {
+                    "type": "volkswagen",
+                    "config": {
+                        "username": username,
+                        "password": password,
+                    },
+                }
+            ]
+        }
+    }
+    cc = CarConnectivity(config=config)
+    cc.startup()
+    cc.fetch_all()
+    return cc
 
 
-def select_vehicle(wc, vin: str | None):
+def select_vehicle(cc: CarConnectivity, vin: str | None):
     """Return (vehicle, error_message). error_message is None on success."""
-    vehicles = list(wc.vehicles.values())
+    vehicles = list(cc.get_garage().list_vehicles())
     if not vehicles:
-        return None, "No vehicles found in this WeConnect account"
+        return None, "No vehicles found in this CarConnectivity account"
     if vin:
         vehicle = next((v for v in vehicles if v.vin.value == vin), None)
         if not vehicle:
             available = [v.vin.value for v in vehicles]
             return None, f"VIN {vin} not found.  Available: {available}"
         return vehicle, None
-    return vehicles[0], None
+    return vehicles[0], None
+
+
+def update(cc: CarConnectivity) -> None:
+    cc.fetch_all()