Rewrite frontend as single self-contained HTML file — all CSS/JS inline, no external files to fail loading

dist/providers/vision/index.d.ts

@@ -0,0 +1,5 @@
+export * from './visionProviderFactory';
+export * from './openAIVisionProvider';
+export * from './geminiVisionProvider';
+export * from './ollamaVisionProvider';
+export * from './openRouterVisionProvider';