Add esbuild production bundle and multi-stage slim Docker image.

Bundle server (and mcp entry) into a single JS file with deps inlined, minify UI into one HTML, and ship only dist/ in the runtime image.

package.json

@@ -1,15 +1,19 @@
 {
   "name": "webshare-api",
   "version": "1.0.0",
-  "description": "Webshare.cz HTTP API: Torznab indexer, fake qBittorrent client, and MCP server for AI agents",
-  "main": "src/index.js",
+  "description": "Webshare.cz HTTP API: Torznab indexer, fake qBittorrent client, Web UI, and MCP server for AI agents",
+  "main": "dist/server.js",
   "bin": {
-    "webshare-mcp": "src/mcp.js"
+    "webshare-mcp": "dist/mcp.js"
   },
   "scripts": {
-    "start": "node src/index.js",
-    "mcp": "node src/mcp.js",
-    "test": "jest --coverage --runInBand"
+    "build": "node scripts/build.mjs",
+    "start": "node dist/server.js",
+    "start:dev": "node src/index.js",
+    "mcp": "node dist/mcp.js",
+    "mcp:dev": "node src/mcp.js",
+    "test": "jest --coverage --runInBand",
+    "prepublishOnly": "npm run build"
   },
   "engines": {
     "node": ">=18"
@@ -23,7 +27,15 @@
     "zod": "^4.4.3"
   },
   "devDependencies": {
+    "esbuild": "^0.25.0",
     "jest": "^30.4.2",
     "supertest": "^7.2.2"
-  }
+  },
+  "files": [
+    "dist",
+    "src",
+    "ui",
+    "LICENSE",
+    "README.md"
+  ]
 }