refactor: 去掉"联调"阶段，新增"BUG"阶段胶囊

- Stage 类型去掉 integration，新增 bug
- 胶囊条：调研 → 产品设计 → UI设计 → 开发 → 测试 → BUG → 上线
- BUG 阶段进度 = 已关闭Bug / 总Bug
- 全部关闭 = done（绿色），有Bug未关闭 = active（蓝色）
- 版本列表/项目详情的阶段筛选同步去掉联调

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/web/app/versions/[id]/page.tsx

@@ -345,6 +345,14 @@ export default function VersionDetailPage() {
                     stageProgress['testing'] = { percent: testPercent, status: allPassed ? 'done' : (hasRunning || executed > 0) ? 'active' : 'idle' };
                   }
 
+                  // BUG 阶段：已关闭Bug / 总Bug
+                  if (versionBugs.length > 0) {
+                    const closedBugs = versionBugs.filter((b) => b.status === 'closed' || b.status === 'rejected').length;
+                    const bugPercent = Math.round((closedBugs / versionBugs.length) * 100);
+                    const allClosed = versionBugs.every((b) => b.status === 'closed' || b.status === 'rejected');
+                    stageProgress['bug'] = { percent: bugPercent, status: allClosed ? 'done' : closedBugs > 0 || versionBugs.length > 0 ? 'active' : 'idle' };
+                  }
+
                   return <CapsuleStages stageProgress={stageProgress as any} />;
                 })()}