feat: add websocket browser service runtime

Wire the service/browser runtime onto the websocket-driven execution path and add the new browser/service modules needed for the submit flow and runtime integration.

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

third_party/zeroclaw/src/tools/read_skill.rs

@@ -200,7 +200,8 @@ pub async fn read_skill_bundle(location: &Path) -> std::io::Result<String> {
             .strip_prefix(&skill_root)
             .unwrap_or(canonical.as_path())
             .display()
-            .to_string();
+            .to_string()
+            .replace('\\', "/");
         output.push_str("\n\n## Referenced File: ");
         output.push_str(&relative);
         output.push_str("\n\n");