feat: 初始化 bls-onoffline-backend 项目基础结构

添加 Kafka 消费者、数据库写入、Redis 集成等核心模块，实现设备上下线事件处理
- 创建项目基础目录结构与配置文件
- 实现 Kafka 消费逻辑与手动提交偏移量
- 添加 PostgreSQL 数据库连接与分区表管理
- 集成 Redis 用于错误队列和项目心跳
- 包含数据处理逻辑，区分重启与非重启数据
- 提供数据库初始化脚本与分区创建工具
- 添加单元测试与代码校验脚本

bls-onoffline-backend/openspec/project.md

@@ -0,0 +1,31 @@
+# Project Context
+
+## Purpose
+[Describe your project's purpose and goals]
+
+## Tech Stack
+- [List your primary technologies]
+- [e.g., TypeScript, React, Node.js]
+
+## Project Conventions
+
+### Code Style
+[Describe your code style preferences, formatting rules, and naming conventions]
+
+### Architecture Patterns
+[Document your architectural decisions and patterns]
+
+### Testing Strategy
+[Explain your testing approach and requirements]
+
+### Git Workflow
+[Describe your branching strategy and commit conventions]
+
+## Domain Context
+[Add domain-specific knowledge that AI assistants need to understand]
+
+## Important Constraints
+[List any technical, business, or regulatory constraints]
+
+## External Dependencies
+[Document key external services, APIs, or systems]