feat: add standalone service chat console

Provide a local HTML console that reuses the existing service websocket so task entry stays outside the browser-helper runtime path.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tests/service_console_html_test.rs

@@ -0,0 +1,21 @@
+use std::fs;
+use std::path::PathBuf;
+
+#[test]
+fn service_console_html_stays_on_service_ws_boundary() {
+    let manifest_dir = PathBuf::from(env!("CARGO_MANIFEST_DIR"));
+    let html_path = manifest_dir
+        .join("frontend")
+        .join("service-console")
+        .join("sg_claw_service_console.html");
+    let source = fs::read_to_string(&html_path).expect("service console html should exist");
+
+    assert!(source.contains("ws://127.0.0.1:42321"));
+    assert!(source.contains("submit_task"));
+    assert!(!source.contains("/sgclaw/browser-helper.html"));
+    assert!(!source.contains("/sgclaw/callback/ready"));
+    assert!(!source.contains("/sgclaw/callback/events"));
+    assert!(!source.contains("/sgclaw/callback/commands/next"));
+    assert!(!source.contains("/sgclaw/callback/commands/ack"));
+    assert!(!source.contains("ws://127.0.0.1:12345"));
+}