feat(security): implement bcrypt hashing for admin password and cleanup Dockerfile

package.json

@@ -10,6 +10,7 @@
   },
   "dependencies": {
     "@prisma/client": "^6.19.0",
+    "bcryptjs": "^3.0.3",
     "music-metadata": "^11.10.2",
     "next": "16.0.3",
     "prisma": "^6.19.0",
@@ -17,6 +18,7 @@
     "react-dom": "19.2.0"
   },
   "devDependencies": {
+    "@types/bcryptjs": "^2.4.6",
     "@types/node": "^20",
     "@types/react": "^19",
     "@types/react-dom": "^19",
@@ -25,4 +27,4 @@
     "eslint-config-next": "16.0.3",
     "typescript": "^5"
   }
-}
+}