fix(infra): make browser relay bind address configurable

Add browser.relayBindHost config option so the Chrome extension relay
server can bind to a non-loopback address (e.g. 0.0.0.0 for WSL2).
Defaults to 127.0.0.1 when unset, preserving current behavior.

Closes #39214

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

src/config/types.browser.ts

@@ -66,4 +66,10 @@ export type BrowserConfig = {
    * Example: ["--window-size=1920,1080", "--disable-infobars"]
    */
   extraArgs?: string[];
+  /**
+   * Bind address for the Chrome extension relay server.
+   * Default: "127.0.0.1". Set to "0.0.0.0" for WSL2 or other environments where
+   * the relay must be reachable from a different network namespace.
+   */
+  relayBindHost?: string;
 };

src/config/zod-schema.ts

@@ -372,6 +372,7 @@ export const OpenClawSchema = z
           )
           .optional(),
         extraArgs: z.array(z.string()).optional(),
+        relayBindHost: z.string().optional(),
       })
       .strict()
       .optional(),