refactor(docker): remove duplicate production stage from Dockerfile

Remove the 'production' stage from Dockerfile that was:
- Duplicating functionality already in Dockerfile.prod
- Incorrectly running 'bun run dev' instead of production command

VPS deployments continue to use Dockerfile.prod as the single
source of truth for production builds. Development Dockerfile
now only contains development stage.

Dockerfile

@@ -33,20 +33,3 @@ EXPOSE 3000
 
 # Default command
 CMD ["bun", "run", "dev"]
-
-# ============================================
-# Production stage - full app with source code
-# ============================================
-FROM base AS production
-
-# Copy dependencies from deps stage
-COPY --from=deps /app/node_modules ./node_modules
-
-# Copy source code
-COPY . .
-
-# Expose ports
-EXPOSE 3000
-
-# Default command
-CMD ["bun", "run", "dev"]