feat: initial frontend - React + TypeScript + Vite

- Login page with JWT auth
- Dashboard with stats and charts
- Issues list with pagination, filtering
- Issue detail with comments, status transitions
- Create issue form
- Dark theme UI
- Docker (nginx) with API proxy to backend
- Sidebar navigation

vite.config.ts

@@ -0,0 +1,21 @@
+import { defineConfig } from 'vite'
+import react from '@vitejs/plugin-react'
+import path from 'path'
+
+export default defineConfig({
+  plugins: [react()],
+  resolve: {
+    alias: { '@': path.resolve(__dirname, './src') },
+  },
+  server: {
+    host: '0.0.0.0',
+    port: 3000,
+    proxy: {
+      '/api': {
+        target: 'http://backend:8000',
+        changeOrigin: true,
+        rewrite: (p) => p.replace(/^\/api/, ''),
+      },
+    },
+  },
+})