feat: add node browser proxy routing

src/config/types.gateway.ts

@@ -175,6 +175,13 @@ export type GatewayHttpConfig = {
 };
 
 export type GatewayNodesConfig = {
+  /** Browser routing policy for node-hosted browser proxies. */
+  browser?: {
+    /** Routing mode (default: auto). */
+    mode?: "auto" | "manual" | "off";
+    /** Pin to a specific node id/name (optional). */
+    node?: string;
+  };
   /** Additional node.invoke commands to allow on the gateway. */
   allowCommands?: string[];
   /** Commands to deny even if they appear in the defaults or node claims. */