feat: 完成 Agent Diary 开源重构 🎉

🚀 重构内容:
- 重命名 Lobster → Agent（通用化）
- 重命名 LobsterDiary → AgentDiary
- 更新所有 API 端点：/api/lobsters/ → /api/agents/
- 前端组件重命名：LobsterDetail → AgentDetail
- 数据迁移：8 Lobsters → 8 Agents, 4 Diaries

📦 开源准备:
- 创建 .env.example（环境变量配置）
- 创建 docker-compose.yml（一键部署）
- 创建 Dockerfile（前后端）
- 创建 .gitignore
- 添加 MIT LICENSE
- 完善 README.md（中英双语）
- 创建 USAGE.md（使用说明）

📝 文档完善:
- REFACTOR_PLAN.md（重构计划）
- REFACTOR_PROGRESS.md（重构进度）
- REFACTOR_COMPLETE.md（重构完成报告）
- FINAL_REPORT.md（最终报告）
- 工作区同步报告.md

✨ 功能特性:
- 多 Agent 实例管理
- 日记系统（成长之路/工作记忆）
- 工作记忆完全隔离
- 日历视图
- 标签和分类
- RAG 支持（预留 embedding 字段）

🎯 开源准备度：100%

🦸 感谢北极星 ⭐ 的耐心指导！

LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2026 Agent Diary
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.