data_model: redesign domain extractors for CarConnectivity object model

Flatten the snapshot structure so each domain maps directly to its
fields rather than mirroring the old WeConnect status-object nesting.
New domains: electric_drive (range, battery/SOC/temps, odometer),
connectivity, vehicle, position, doors — replacing the old readiness,
parking, access, and measurements domains.  Update apply_procedural
paths and collect.py defaults accordingly.

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

collect.py

@@ -18,7 +18,7 @@ Usage examples
 # Override domains on the CLI:
   python collect.py -c credentials/alex.json -d charging,measurements
 
-Available domains: charging, climatisation, measurements, readiness, parking, access
+Available domains: charging, climatisation, electric_drive, connectivity, vehicle, position, doors
 
 Credentials file format (JSON)
 -------------------------------
@@ -191,7 +191,7 @@ def main() -> None:
         help=(
             "Comma-separated domains to collect, or 'all' (overrides credentials file).  "
             f"Available: {', '.join(ALL_DOMAINS)}.  "
-            "Default: charging,measurements,readiness"
+            "Default: charging,electric_drive,connectivity"
         ),
     )
     p.add_argument(
@@ -273,7 +273,7 @@ def main() -> None:
         if isinstance(raw_domains, list):
             args.domains = ",".join(raw_domains)
         else:
-            args.domains = raw_domains or "charging,measurements,readiness"
+            args.domains = raw_domains or "charging,electric_drive,connectivity"
 
     if args.interval is None:
         args.interval = int(creds_data.get("interval_s", 300))