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

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sgclaw_config.json

@@ -0,0 +1,9 @@
+{
+  "apiKey": "direct-submit-placeholder-key",
+  "baseUrl": "http://127.0.0.1/direct-submit",
+  "model": "direct-submit-placeholder-model",
+  "skillsDir": "D:/data/ideaSpace/rust/sgClaw/claw/claw/skills/skill_staging/skills",
+  "directSubmitSkill": "tq-lineloss-report.collect_lineloss",
+  "runtimeProfile": "browser-attached",
+  "browserBackend": "super-rpa"
+}