refactor: consolidate Dockerfiles into a single Dockerfile and update build context

Author: whiteSHADOW1234

backend/Dockerfile renamed to Dockerfile

@@ -4,7 +4,7 @@
   "description": "Backend for coffee bean ordering app",
   "main": "src/server.js",
   "scripts": {
-    "start": "node dist/server.js",
+    "start": "node src/server.js",
     "build": "node build.js",
     "test": "jest --detectOpenHandles --forceExit"
   },

backend/package.json

@@ -4,9 +4,9 @@ services:
   app:
     build:
       context: .
-      dockerfile: backend/Dockerfile
+      dockerfile: ./Dockerfile
       args:
-        - API_BASE_URL=/api/orders
+        - API_BASE_URL=${API_BASE_URL}
     ports:
       - "3309:3309"
     environment: