feat: 重构项目心跳数据结构并实现项目列表API

- 新增统一项目列表Redis键和迁移工具
- 实现GET /api/projects端点获取项目列表
- 实现POST /api/projects/migrate端点支持数据迁移
- 更新前端ProjectSelector组件使用真实项目数据
- 扩展projectStore状态管理
- 更新相关文档和OpenSpec规范
- 添加测试用例验证新功能

openspec/changes/update-redis-protocol/specs/command/spec.md

@@ -1,14 +1,17 @@
 ## MODIFIED Requirements
 
 ### Requirement: Command Sending to Redis
+
 The system SHALL send commands to a per-target Redis key.
 
 #### Scenario: Console enqueues a command for a target project
+
 - **WHEN** the user sends a command from the console
 - **THEN** the backend SHALL append a JSON message to Redis LIST key `${targetProjectName}_控制`
 - **AND** the JSON message SHALL represent the command payload (an object)
 
 #### Scenario: Target project consumes a command
+
 - **WHEN** a target project listens for commands
 - **THEN** it SHALL consume messages from `${projectName}_控制` as JSON objects
 - **AND** it SHOULD use Redis LIST queue semantics (producer `RPUSH`, consumer `BLPOP`)