Consolidate to single server with unified package.json

- Merge client and server dependencies into root package.json
- Remove separate client/package.json and server/package.json
- Update server/index.js to serve built client static files
- Simplify Dockerfile to single build + production stage
- Update dev scripts for unified development workflow
- SPA routing serves index.html for non-API routes

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

client/package.json

@@ -1,34 +0,0 @@
-{
-  "name": "client",
-  "private": true,
-  "version": "0.0.0",
-  "type": "module",
-  "scripts": {
-    "dev": "vite",
-    "build": "vite build",
-    "lint": "eslint .",
-    "preview": "vite preview"
-  },
-  "dependencies": {
-    "react": "^19.2.5",
-    "react-dom": "^19.2.5",
-    "react-konva": "^18.2.10",
-    "konva": "^9.3.18",
-    "use-image": "^1.1.1",
-    "@xenova/transformers": "^2.17.2",
-    "react-filerobot-image-editor": "^4.8.1"
-  },
-  "devDependencies": {
-    "@eslint/js": "^9.39.4",
-    "@types/react": "^19.2.14",
-    "@types/react-dom": "^19.2.3",
-    "@vitejs/plugin-react": "^6.0.1",
-    "eslint": "^9.39.4",
-    "eslint-plugin-react-hooks": "^7.1.1",
-    "eslint-plugin-react-refresh": "^0.5.2",
-    "globals": "^17.5.0",
-    "vite": "^8.0.9",
-    "vite-plugin-pwa": "^0.20.5",
-    "workbox-window": "^7.1.0"
-  }
-}

client/vite.config.js

@@ -154,4 +154,7 @@ export default defineConfig({
       },
     },
   },
+  build: {
+    outDir: 'dist',
+  },
 });