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]

tests/service_protocol_update_config_test.rs

@@ -0,0 +1,72 @@
+use sgclaw::service::{ClientMessage, ConfigUpdatePayload, ServiceMessage};
+
+#[test]
+fn update_config_serializes_correctly() {
+    let config = ConfigUpdatePayload {
+        api_key: Some("test-key".to_string()),
+        base_url: Some("https://api.example.com".to_string()),
+        model: Some("test-model".to_string()),
+        skills_dir: Some("/path/to/skills".to_string()),
+        direct_submit_skill: Some("my-skill.my-tool".to_string()),
+        runtime_profile: Some("browser-attached".to_string()),
+        browser_backend: Some("super-rpa".to_string()),
+    };
+
+    let msg = ClientMessage::UpdateConfig { config };
+    let json = serde_json::to_string(&msg).unwrap();
+
+    assert!(json.contains("\"type\":\"update_config\""));
+    assert!(json.contains("\"apiKey\":\"test-key\""));
+    assert!(json.contains("\"baseUrl\":\"https://api.example.com\""));
+    assert!(json.contains("\"model\":\"test-model\""));
+}
+
+#[test]
+fn update_config_deserializes_correctly() {
+    let json = r#"{
+        "type": "update_config",
+        "config": {
+            "apiKey": "key123",
+            "baseUrl": "https://api.test.com",
+            "model": "gpt-4"
+        }
+    }"#;
+
+    let msg: ClientMessage = serde_json::from_str(json).unwrap();
+    match msg {
+        ClientMessage::UpdateConfig { config } => {
+            assert_eq!(config.api_key, Some("key123".to_string()));
+            assert_eq!(config.base_url, Some("https://api.test.com".to_string()));
+            assert_eq!(config.model, Some("gpt-4".to_string()));
+            assert!(config.skills_dir.is_none());
+        }
+        _ => panic!("expected UpdateConfig variant"),
+    }
+}
+
+#[test]
+fn config_updated_serializes_correctly() {
+    let msg = ServiceMessage::ConfigUpdated {
+        success: true,
+        message: "配置已保存".to_string(),
+    };
+    let json = serde_json::to_string(&msg).unwrap();
+
+    assert!(json.contains("\"type\":\"config_updated\""));
+    assert!(json.contains("\"success\":true"));
+    assert!(json.contains("配置已保存"));
+}
+
+#[test]
+fn config_updated_deserializes_correctly() {
+    let json = r#"{"type":"config_updated","success":false,"message":"保存失败"}"#;
+    let msg: ServiceMessage = serde_json::from_str(json).unwrap();
+
+    match msg {
+        ServiceMessage::ConfigUpdated { success, message } => {
+            assert!(!success);
+            assert_eq!(message, "保存失败");
+        }
+        _ => panic!("expected ConfigUpdated variant"),
+    }
+}