feat: add plugin HTTP hooks + Zalo plugin

src/gateway/server/__tests__/test-utils.ts

@@ -0,0 +1,22 @@
+import type { PluginRegistry } from "../../../plugins/registry.js";
+
+export const createTestRegistry = (
+  overrides: Partial<PluginRegistry> = {},
+): PluginRegistry => {
+  const base: PluginRegistry = {
+    plugins: [],
+    tools: [],
+    channels: [],
+    gatewayHandlers: {},
+    httpHandlers: [],
+    cliRegistrars: [],
+    services: [],
+    diagnostics: [],
+  };
+  const merged = { ...base, ...overrides };
+  return {
+    ...merged,
+    gatewayHandlers: merged.gatewayHandlers ?? {},
+    httpHandlers: merged.httpHandlers ?? [],
+  };
+};