Fix Docker build: provide DATABASE_URL for Prisma generate

Dockerfile

@@ -9,6 +9,7 @@ RUN npm install
 
 # Build the application
 COPY . .
+ENV DATABASE_URL="file:./prisma/dev.db"
 RUN npx prisma generate
 RUN npm run build
 
@@ -18,6 +19,7 @@ WORKDIR /app
 
 ENV NODE_ENV=production
 ENV PORT=3000
+ENV DATABASE_URL="file:./prisma/dev.db"
 
 # Install production dependencies only
 COPY package*.json ./