refactor: 全局替换 spring-ai -> rui-framework

同步仓库名称变更，涉及 16 个文件 66 处引用：
- ai-skills: 菜单配置
- backend/guides: AI操作手册、环境配置、部署、gitnexus、opencode 工作流
- backend: 模块创建规则、通信规范、协作工作流、实施规范
- frontend: 收银设计、管理后台实施计划
- standards: 数据库设计规范

backend/guides/gitnexus-guide.md

@@ -1,6 +1,6 @@
 # GitNexus — Code Intelligence 使用指南
 
-> **项目索引**: spring-ai (2690 symbols, 5387 relationships, 218 execution flows)
+> **项目索引**: rui-framework (2690 symbols, 5387 relationships, 218 execution flows)
 
 ## 基本概念
 
@@ -27,10 +27,10 @@ GitNexus 是一个代码智能工具，通过索引代码库构建知识图谱
 
 | Resource | Use for |
 |----------|---------|
-| `gitnexus://repo/spring-ai/context` | Codebase overview, check index freshness |
-| `gitnexus://repo/spring-ai/clusters` | All functional areas |
-| `gitnexus://repo/spring-ai/processes` | All execution flows |
-| `gitnexus://repo/spring-ai/process/{name}` | Step-by-step execution trace |
+| `gitnexus://repo/rui-framework/context` | Codebase overview, check index freshness |
+| `gitnexus://repo/rui-framework/clusters` | All functional areas |
+| `gitnexus://repo/rui-framework/processes` | All execution flows |
+| `gitnexus://repo/rui-framework/process/{name}` | Step-by-step execution trace |
 
 ## 技能参考