docs: update documentation for title expression feature

- Expand TitleGroovyRequest documentation in backend CLAUDE.md with detailed field descriptions
- Frontend CLAUDE.md already has complete Node Title Configuration section
- Mark title-expression-ui design doc as implemented

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: xlorne

CLAUDE.md

@@ -144,7 +144,12 @@ The workflow engine is organized into 8 layers:
 
 8. **Script Layer** (`com.codingapi.flow.script.runtime`)
    - `ScriptRuntimeContext` - Groovy script execution with thread-safe design and auto-cleanup
-   - `TitleGroovyRequest` - Context object for title expression scripts, providing access to operator info, workflow info, form data, and work code
+   - `TitleGroovyRequest` - Context object for title expression scripts, providing access to:
+     - Operator information: `operatorName`, `operatorId`, `isFlowManager`
+     - Workflow information: `workflowTitle`, `workflowCode`, `nodeName`, `nodeType`
+     - Creator information: `creatorName`
+     - Form data: `formData` map with `getFormData(key)` method
+     - Work code: `workCode`
    - Script types: OperatorMatchScript, OperatorLoadScript, NodeTitleScript, ConditionScript, RouterNodeScript, SubProcessScript, TriggerScript, ErrorTriggerScript, RejectActionScript, CustomScript
 
 ### Supporting Architectures

designs/title-expression-ui/README.md

@@ -1,5 +1,8 @@
 # 标题表达式交互式UI设计
 
+> **Status**: ✅ Implemented (2025-02-26)
+> **Plan**: `docs/plans/2025-02-26-title-expression-ui.md`
+
 ## 1. 需求概述
 
 将节点标题表达式的配置从"直接编写Groovy脚本"改为"交互式可视化配置"，同时保留高级用户直接编写脚本的能力。