Add Chinese documentation for custom skills development and reference guide

- Created a new document for custom skills development (`custom.md`) detailing the structure, creation, implementation, and best practices for developing custom CCW skills.
- Added an index document (`index.md`) summarizing all built-in skills, their categories, and usage examples.
- Introduced a reference guide (`reference.md`) providing a quick reference for all 33 built-in CCW skills, including triggers and purposes.

.claude/skills/workflow-multi-cli-plan/phases/02-lite-execute.md

@@ -357,9 +357,9 @@ executionCalls = createExecutionCalls(getTasks(planObject), executionMethod).map
 
 TodoWrite({
   todos: executionCalls.map(c => ({
-    content: `${c.executionType === "parallel" ? "⚡" : "→"} ${c.id} (${c.tasks.length} tasks)`,
+    content: `${c.executionType === "parallel" ? "⚡" : "→"} ${c.id} [${c.executor}] (${c.tasks.length} tasks)`,
     status: "pending",
-    activeForm: `Executing ${c.id}`
+    activeForm: `Executing ${c.id} [${c.executor}]`
   }))
 })
 ```