chore(cleanup): remove redundant folders and unused environment variables

Author: eddyseed

backend/package.json

@@ -7,10 +7,7 @@
     "test": "echo \"Error: no test specified\" && exit 1",
     "dev": "tsx watch src/index.ts",
     "build": "tsc",
-    "start": "tsx src/index.ts",
-    "db-generate": "prisma generate",
-    "db-push": "prisma db push",
-    "db-studio": "prisma studio"
+    "start": "tsx src/index.ts"
   },
   "keywords": [],
   "author": "",

backend/prisma/schema.prisma

@@ -11,11 +11,6 @@ export const SERVER_ENV = {
   LOCAL_HOST: process.env.LOCAL_HOST || "http://localhost:3001",
   CORS_ORIGIN: process.env.CORS_ORIGIN || "http://localhost:5173",
 };
-
-export const DB_ENV = {
-  DATABASE_URL: process.env.DATABASE_URL || "",
-};
-
 export const MODEL_ENV = {
   OLLAMA_HOST: process.env.OLLAMA_HOST || "http://localhost:11434",
   MODEL_NAME: process.env.MODEL_NAME || "phi3:mini",