Refactor collect.py into focused modules

- data_model.py  : _str, _phys, load_store, save_store, auto_out_path
- we_connect.py  : domain extractors, ALL_DOMAINS, connect,
                   select_vehicle, collect_snapshot
- network.py     : TCP push server (start_push_server, broadcast)
- log_config.py  : logging setup
- collect.py     : run() loop and CLI, wired to the above modules

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

data_model.py

@@ -0,0 +1,43 @@
+import json
+import logging
+from datetime import datetime, timezone
+from pathlib import Path
+
+log = logging.getLogger(__name__)
+
+
+def _str(v) -> str:
+    return str(v.value) if hasattr(v, "value") else str(v)
+
+
+def _phys(value, unit: str) -> dict:
+    return {"value": value, "unit": unit}
+
+
+def auto_out_path(logs_dir: Path, vin: str) -> Path:
+    stamp = datetime.now(timezone.utc).strftime("%Y_%m_%d_%H_%M_%S")
+    return logs_dir / f"{stamp}_{vin}.json"
+
+
+def load_store(path: Path, vin: str, interval: int) -> dict:
+    if path.exists():
+        try:
+            data = json.loads(path.read_text())
+            if isinstance(data, dict) and "records" in data:
+                return data
+        except json.JSONDecodeError:
+            log.warning("Output file is corrupt — starting fresh")
+    return {
+        "meta": {
+            "vin": vin,
+            "created_at": datetime.now(timezone.utc).isoformat(),
+            "interval_seconds": interval,
+        },
+        "records": [],
+    }
+
+
+def save_store(path: Path, store: dict, max_records: int | None) -> None:
+    if max_records and len(store["records"]) > max_records:
+        store["records"] = store["records"][-max_records:]
+    path.write_text(json.dumps(store, indent=2, default=str))