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]

src/browser/callback_backend.rs

@@ -436,14 +436,16 @@ fn build_eval_js(source_url: &str, script: &str) -> String {
     let events_url = escape_js_single_quoted(&events_endpoint_url(source_url));
 
     format!(
-        "(async function(){{try{{\
-         var v=await (async function(){{return {script}}})();\
-         if(v&&typeof v.then==='function'){{v=await v;}}\
+        "(function(){{try{{\
+         var v=(function(){{return {script}}})();\
+         function _s(v){{\
          var t=(typeof v==='string')?v:JSON.stringify(v);\
          try{{callBackJsToCpp('{escaped_source_url}@_@'+window.location.href+'@_@{callback}@_@sgBrowserExcuteJsCodeByDomain@_@'+(t??''))}}catch(_){{}}\
          var j=JSON.stringify({{type:'callback',callback:'{callback}',request_url:'{escaped_source_url}',payload:{{value:(t??'')}}}});\
          try{{var r=new XMLHttpRequest();r.open('POST','{events_url}',true);r.setRequestHeader('Content-Type','application/json');r.send(j)}}catch(_){{}}\
          try{{navigator.sendBeacon('{events_url}',new Blob([j],{{type:'application/json'}}))}}catch(_){{}}\
+         }}\
+         if(v&&typeof v.then==='function'){{v.then(_s).catch(function(){{}});}}else{{_s(v);}}\
          }}catch(e){{}}}})()"
     )
 }