fix: update Dockerfile to copy dist/ instead of socket-server.js and src/

**Problem:**
- Dockerfile was trying to copy socket-server.js from root (no longer exists)
- Also copying entire src/ directory instead of compiled dist/

**Solution:**
- Changed to copy dist/ directory which contains all compiled server code
- Removed separate socket-server.js copy (now in dist/)
- Removed src/ copy (runtime only needs compiled code)

**Files changed:**
- Line 50-51: Replaced socket-server.js and src/ copies with single dist/ copy

**Tested:**
- Docker build completes successfully ✓
- Container starts and Socket.IO initializes ✓
- Server responds on port 3000 ✓

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Dockerfile

@@ -47,8 +47,7 @@ COPY --from=builder --chown=nextjs:nodejs /app/apps/web/public ./apps/web/public
 
 # Copy server files (compiled from TypeScript)
 COPY --from=builder --chown=nextjs:nodejs /app/apps/web/server.js ./apps/web/
-COPY --from=builder --chown=nextjs:nodejs /app/apps/web/socket-server.js ./apps/web/
-COPY --from=builder --chown=nextjs:nodejs /app/apps/web/src ./apps/web/src
+COPY --from=builder --chown=nextjs:nodejs /app/apps/web/dist ./apps/web/dist
 
 # Copy database migrations
 COPY --from=builder --chown=nextjs:nodejs /app/apps/web/drizzle ./apps/web/drizzle