feat: Add file name display in WebUI

Backend:
- Add file_path field to DocStatusResponse
- Update document status response creation

Frontend:
- Remove metadata column
- Improve filename display with truncation and tooltips
- Add show/hide filename toggle with proper styling
- Update translations for all supported languages"

lightrag_webui/src/api/lightrag.ts

@@ -124,6 +124,7 @@ export type DocStatusResponse = {
   chunks_count?: number
   error?: string
   metadata?: Record<string, any>
+  file_path: string
 }
 
 export type DocsStatusesResponse = {