feat: 重构项目心跳为Redis LIST并更新相关文档

重构项目心跳数据结构为Redis LIST，更新相关文档和OpenSpec规范。主要变更包括：
- 将项目心跳从STRING改为LIST类型
- 更新后端服务以支持LIST操作
- 同步更新文档和OpenSpec规范
- 统一后端端口为3001
- 添加部署指南和Windows部署文档

修复前端API请求路径，移除硬编码的localhost地址。添加PM2和Nginx配置文件模板，完善部署流程文档。更新Redis集成协议文档，明确LIST数据结构和外部项目对接规范。

openspec/specs/redis-connection/spec.md

@@ -1,7 +1,7 @@
 # Redis Connection Capability Specification
 
 ## Overview
-This specification defines the Redis connection capability for the BLS Project Console, which manages the connection between the system and the Redis server for reading logs and sending commands.
+This specification defines the Redis connection capability for the BLS Project Console, which manages the connection between the system and the Redis server for reading logs and retrieving project heartbeats.
 
 ## Requirements
 
@@ -20,6 +20,7 @@ The system SHALL allow configuration of Redis connection parameters.
 - **WHEN** the server starts with Redis environment variables set
 - **THEN** it SHALL use those variables to configure the Redis connection
 - **AND** it SHALL override default values
+- **AND** it SHALL use Redis database 15
 
 ### Requirement: Redis Connection Reconnection
 The system SHALL automatically reconnect to Redis if the connection is lost.
@@ -47,6 +48,15 @@ The system SHALL monitor the Redis connection status.
 - **THEN** the system SHALL update the connection status in the UI
 - **AND** it SHALL log the status change
 
+### Requirement: Project Heartbeat List Retrieval
+The system SHALL read project heartbeats from Redis key `项目心跳` stored as a LIST.
+
+#### Scenario: Reading projects list from Redis LIST
+- **WHEN** the client requests the projects list
+- **THEN** the system SHALL read `LRANGE 项目心跳 0 -1`
+- **AND** it SHALL parse each list element as JSON heartbeat record
+- **AND** it SHALL deduplicate by `projectName` and keep the latest `lastActiveAt`
+
 ## Data Model
 
 ### Redis Connection Configuration
@@ -139,3 +149,9 @@ The system SHALL monitor the Redis connection status.
     "deleteOldKeys": false
   }
   ```
+
+## Redis Data Structures
+
+### Key: 项目心跳
+- **Type**: LIST
+- **Element**: JSON string `{"projectName":"...","apiBaseUrl":"...","lastActiveAt":1768566165572}`