feat: add universal adapters for browser compatibility

- Create universal adapters for cross-platform support (browser/Node/serverless)
- Replace Node.js-specific imports with universal implementations
- Add OPFS support for browser persistent storage
- Maintain same BrainyData interface across all environments
- Enable real Brainy usage in browser console UI
- Keep package size optimized (no bloat)

Universal adapters in /src/universal/:
- uuid.ts: Cross-platform UUID generation
- crypto.ts: Browser/Node crypto operations
- fs.ts: OPFS/FileSystem/Memory storage adapter
- path.ts: Universal path operations
- events.ts: EventEmitter compatibility layer

This enables 'write once, run anywhere' for Brainy while maintaining
the exact same API. No breaking changes to existing code.

vite.browser.config.ts

@@ -0,0 +1,40 @@
+import { defineConfig } from 'vite'
+import { resolve } from 'path'
+
+export default defineConfig({
+  build: {
+    target: 'es2022',
+    lib: {
+      entry: resolve(__dirname, 'dist/browser-build/browserFramework.js'),
+      name: 'Brainy',
+      fileName: 'brainy-browser-bundle',
+      formats: ['es', 'umd']
+    },
+    rollupOptions: {
+      output: {
+        dir: 'dist/browser',
+        entryFileNames: '[name].js',
+        chunkFileNames: '[name].js'
+      }
+    },
+    sourcemap: true,
+    minify: false, // Keep unminified for debugging
+    outDir: 'dist/browser'
+  },
+  define: {
+    'process.env.NODE_ENV': JSON.stringify('production'),
+    global: 'globalThis',
+    'process.env': '{}'
+  },
+  optimizeDeps: {
+    include: ['@huggingface/transformers', 'uuid', 'crypto-browserify', 'buffer']
+  },
+  resolve: {
+    alias: {
+      crypto: 'crypto-browserify',
+      buffer: 'buffer',
+      process: 'process/browser',
+      util: 'util'
+    }
+  }
+})