Initial commit: Gaming Hub foundation

Plugin-based Discord bot framework with web frontend:
- Core: Discord.js client, SSE broadcast, JSON persistence
- Plugin system: lifecycle hooks (init, onReady, routes, snapshot, destroy)
- Web: React 19 + Vite 6 + TypeScript, tab-based navigation
- Docker: multi-stage build (Node 24, static ffmpeg, yt-dlp)
- GitLab CI: Kaniko with LAN registry caching

Ready for plugin development.

web/vite.config.ts

@@ -0,0 +1,13 @@
+import { defineConfig } from 'vite';
+import react from '@vitejs/plugin-react';
+
+export default defineConfig({
+  plugins: [react()],
+  server: {
+    proxy: { '/api': 'http://localhost:8080' },
+  },
+  define: {
+    'import.meta.env.VITE_APP_VERSION': JSON.stringify(process.env.VITE_APP_VERSION ?? '1.0.0-dev'),
+    'import.meta.env.VITE_BUILD_CHANNEL': JSON.stringify(process.env.VITE_BUILD_CHANNEL ?? 'dev'),
+  },
+});