FRE-600: Implement Phase 1 WebSocket + Yjs CRDT foundation

- Create TypeScript and Vite configuration for SolidJS
- Implement Yjs document structure for screenplay collaboration
- Build WebSocket connection manager with exponential backoff reconnection
- Create CRDT document manager with undo/redo support
- Set up WebSocket sync server with JWT authentication
- Add SolidJS reactive bindings for Yjs shared types
- Build collaborative editor component
- Write unit tests for CRDT operations
- Document implementation in analysis/fre600_websocket_foundation.md

Architecture: Yjs chosen over Automerge for better ecosystem and
Tauri compatibility. WebSocket for sync, WebRTC for video.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

vite.config.ts

@@ -0,0 +1,37 @@
+import { defineConfig } from 'vite';
+import solid from 'vite-plugin-solid';
+import { resolve } from 'path';
+
+export default defineConfig({
+  plugins: [solid()],
+  resolve: {
+    alias: {
+      '@lib': resolve(__dirname, './src/lib'),
+      '@components': resolve(__dirname, './src/components'),
+      '@types': resolve(__dirname, './src/types'),
+    },
+  },
+  build: {
+    target: 'esnext',
+    outDir: 'dist',
+    sourcemap: true,
+    rollupOptions: {
+      input: {
+        main: resolve(__dirname, 'index.html'),
+      },
+    },
+  },
+  server: {
+    port: 3000,
+    proxy: {
+      '/sync': {
+        target: 'ws://localhost:8080',
+        ws: true,
+      },
+    },
+  },
+  test: {
+    globals: true,
+    environment: 'node',
+  },
+});