Move server modules into server/ package

data_model, log_config, network, storage_helpers, we_connect are now
under server/. collect.py stays in the project root and imports via
the server package.

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

collect.py

@@ -55,11 +55,9 @@ import time
 from datetime import datetime, timezone
 from pathlib import Path
 
-import log_config
-import network
-import we_connect
-from data_model import ALL_DOMAINS, collect_snapshot
-from storage_helpers import auto_out_path, load_store, save_store
+from server import log_config, network, we_connect
+from server.data_model import ALL_DOMAINS, collect_snapshot
+from server.storage_helpers import auto_out_path, load_store, save_store
 
 log = logging.getLogger(__name__)