Add web client and containerized deployment stack

Web client:

- Added React + TypeScript + Vite + Tailwind application in web/.

- Implemented auth, chat list, chat messages, typing indicators, file uploads, and voice recording/playback.

- Added typed API layer, Zustand stores, and realtime websocket hook integration.

Containerization:

- Added backend Dockerfile and project .dockerignore.

- Added web multi-stage Dockerfile with nginx static hosting and API/WS reverse proxy.

- Added full docker-compose stack with postgres, redis, minio, backend, worker, mailpit, and web.

- Added MinIO bucket bootstrap init job and updated README with Docker quick-start.

web/package.json

@@ -0,0 +1,27 @@
+{
+  "name": "benya-messenger-web",
+  "version": "0.1.0",
+  "private": true,
+  "type": "module",
+  "scripts": {
+    "dev": "vite",
+    "build": "tsc -b && vite build",
+    "preview": "vite preview"
+  },
+  "dependencies": {
+    "axios": "1.11.0",
+    "react": "18.3.1",
+    "react-dom": "18.3.1",
+    "zustand": "5.0.8"
+  },
+  "devDependencies": {
+    "@types/react": "18.3.24",
+    "@types/react-dom": "18.3.7",
+    "@vitejs/plugin-react": "5.0.2",
+    "autoprefixer": "10.4.21",
+    "postcss": "8.5.6",
+    "tailwindcss": "3.4.17",
+    "typescript": "5.9.2",
+    "vite": "7.1.3"
+  }
+}