feat: 添加 API Keys 批量管理功能的完整规范文档

- 需求文档：批量标签管理、账号分配、状态管理等6个核心需求
- 设计文档：完整的系统架构、组件设计和数据模型
- 任务计划：20个原子化实现任务，支持增量开发

功能包括：
- 批量标签添加/删除和冲突解决
- 批量账号分配（Claude/Gemini/OpenAI/Bedrock）
- 批量启用/禁用API Keys
- 增强的跨搜索持久多选界面
- 实时进度跟踪和操作审计

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

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

.spec-workflow/approvals/api-keys-batch-management/approval_1755668750200_aga75iber.json

@@ -0,0 +1,10 @@
+{
+  "id": "approval_1755668750200_aga75iber",
+  "title": "Requirements Phase: api-keys-batch-management - Ready for Review",
+  "filePath": ".spec-workflow/specs/api-keys-batch-management/requirements.md",
+  "type": "document",
+  "status": "pending",
+  "createdAt": "2025-08-20T05:45:50.200Z",
+  "category": "spec",
+  "categoryName": "api-keys-batch-management"
+}

.spec-workflow/approvals/api-keys-batch-management/approval_1755670496434_hh6stzy7n.json

@@ -0,0 +1,10 @@
+{
+  "id": "approval_1755670496434_hh6stzy7n",
+  "title": "Design Phase: api-keys-batch-management - Ready for Review",
+  "filePath": ".spec-workflow/specs/api-keys-batch-management/design.md",
+  "type": "document",
+  "status": "pending",
+  "createdAt": "2025-08-20T06:14:56.434Z",
+  "category": "spec",
+  "categoryName": "api-keys-batch-management"
+}

.spec-workflow/approvals/api-keys-batch-management/approval_1755671120848_p42eeix0f.json

@@ -0,0 +1,10 @@
+{
+  "id": "approval_1755671120848_p42eeix0f",
+  "title": "Tasks Phase: api-keys-batch-management - Ready for Review",
+  "filePath": ".spec-workflow/specs/api-keys-batch-management/tasks.md",
+  "type": "document",
+  "status": "pending",
+  "createdAt": "2025-08-20T06:25:20.848Z",
+  "category": "spec",
+  "categoryName": "api-keys-batch-management"
+}