WebUI Architecture Cleanup (#19541)

* webui: architecture foundation (non-MCP core refactors)

* chore: update webui build output

tools/server/webui/src/lib/utils/modality-file-validation.ts

@@ -5,12 +5,7 @@
 
 import { getFileTypeCategory } from '$lib/utils';
 import { FileTypeCategory } from '$lib/enums';
-
-/** Modality capabilities for file validation */
-export interface ModalityCapabilities {
-	hasVision: boolean;
-	hasAudio: boolean;
-}
+import type { ModalityCapabilities } from '$lib/types/models';
 
 /**
  * Check if a file type is supported by the given modalities