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/compat/direct_skill_runtime.rs

@@ -330,8 +330,7 @@ fn derive_expected_domain(task_context: &CompatTaskContext) -> Result<String, Pi
         .filter(|value| !value.is_empty())
         .ok_or_else(|| {
             PipeError::Protocol(
-                "direct submit skill requires page_url so expected_domain can be derived"
-                    .to_string(),
+                "当前命令需要浏览器页面上下文才能执行。请在浏览器中打开目标页面后重试，或在指令末尾添加'。。。'使用确定性提交。".to_string(),
             )
         })?;