feat: service console auto-connect, settings panel, and batch of enhancements

- Auto-connect WebSocket on page load in service console
- Settings modal for editing sgclaw_config.json (API key, base URL, model, skills dir, etc.)
- UpdateConfig/ConfigUpdated protocol messages for remote config save
- save_to_path() for SgClawSettings serialization
- ConfigUpdated handler in sg_claw_client binary
- Protocol serialization tests for new message types
- HTML test assertions for auto-connect and settings UI
- Additional pending changes: deterministic submit, org units, lineloss xlsx export, browser script tool, and docs

🤖 Generated with [Qoder][https://qoder.com]

.sgclaw-zeroclaw-workspace/state/memory_hygiene_state.json

@@ -0,0 +1,10 @@
+{
+  "last_run_at": "2026-04-12T03:08:25.764151200+00:00",
+  "last_report": {
+    "archived_memory_files": 0,
+    "archived_session_files": 0,
+    "purged_memory_archives": 0,
+    "purged_session_archives": 0,
+    "pruned_conversation_rows": 0
+  }
+}