feat(modules): port new command modules + update registry

- Add new modules: doantu, semantle, twentyq, ai (Gemini integration)
- Update module registry with new command registration
- Update tests and documentation for module system
- Update README with new module references

internal/server/router_test.go

@@ -15,7 +15,7 @@ const testCronSecret = "shared-cron-secret"
 
 func buildRegistry(t *testing.T, factories map[string]modules.Factory, names ...string) *modules.Registry {
 	t.Helper()
-	reg, err := modules.Build(names, factories, storage.NewMemoryProvider(), nil)
+	reg, err := modules.Build(names, factories, storage.NewMemoryProvider(), nil, modules.BuildOptions{})
 	if err != nil {
 		t.Fatalf("modules.Build: %v", err)
 	}