Refactor Dockerfile and entrypoint.sh for improved backend build process

Dockerfile

@@ -32,25 +32,19 @@ COPY packages/api-contract/package.json packages/api-contract/
 RUN bun install
 
 # =============================================================================
-# Stage 4: Prisma Generate
+# Stage 4: Build Backend (prisma generate + tsc)
 # =============================================================================
-FROM deps-backend AS prisma
+FROM deps-backend AS build-backend
 WORKDIR /app
 ARG DATABASE_URL
-ENV DATABASE_URL=${DATABASE_URL}
+ENV DATABASE_URL=${DATABASE_URL:-postgresql://dummy:dummy@localhost:5432/dummy}
 COPY apps/backend ./apps/backend
-RUN bun --cwd apps/backend prisma:generate
-
-# =============================================================================
-# Stage 5: Build Backend
-# =============================================================================
-FROM prisma AS build-backend
-WORKDIR /app
 COPY packages ./packages
+RUN bun --cwd apps/backend prisma:generate
 RUN bun --cwd apps/backend build
 
 # =============================================================================
-# Stage 6: Runner - Production image
+# Stage 5: Runner - Production image
 # =============================================================================
 FROM oven/bun:1.3.11 AS runner
 WORKDIR /app
@@ -60,7 +54,7 @@ COPY --from=build-backend /app/node_modules ./node_modules
 COPY --from=build-frontend /app/apps/frontend/dist ./apps/backend/public
 COPY --from=build-backend /app/apps/backend ./apps/backend
 COPY --from=build-backend /app/packages ./packages
-COPY package.json ./
+COPY package.json bun.lock ./
 COPY entrypoint.sh /app/entrypoint.sh
 
 RUN chmod +x /app/entrypoint.sh