feat(ecc): prune plugin 43→12 items, promote 7 rules to .claude/rules/ (#245)

ECC community plugin pruning: removed 530+ non-essential files
(.cursor/, .opencode/, docs/ja-JP, docs/zh-CN, docs/zh-TW,
language-specific skills/agents/rules). Retained 4 agents,
3 commands, 5 skills. Promoted 13 rule files (8 common + 5
typescript) to .claude/rules/ for CC native loading. Extracted
reusable patterns to EXTRACTED-PATTERNS.md.

docs/zh-TW/rules/patterns.md

@@ -1,55 +0,0 @@
-# 常見模式
-
-## API 回應格式
-
-```typescript
-interface ApiResponse<T> {
-  success: boolean
-  data?: T
-  error?: string
-  meta?: {
-    total: number
-    page: number
-    limit: number
-  }
-}
-```
-
-## 自訂 Hooks 模式
-
-```typescript
-export function useDebounce<T>(value: T, delay: number): T {
-  const [debouncedValue, setDebouncedValue] = useState<T>(value)
-
-  useEffect(() => {
-    const handler = setTimeout(() => setDebouncedValue(value), delay)
-    return () => clearTimeout(handler)
-  }, [value, delay])
-
-  return debouncedValue
-}
-```
-
-## Repository 模式
-
-```typescript
-interface Repository<T> {
-  findAll(filters?: Filters): Promise<T[]>
-  findById(id: string): Promise<T | null>
-  create(data: CreateDto): Promise<T>
-  update(id: string, data: UpdateDto): Promise<T>
-  delete(id: string): Promise<void>
-}
-```
-
-## 骨架專案
-
-實作新功能時：
-1. 搜尋經過實戰驗證的骨架專案
-2. 使用平行 agents 評估選項：
-   - 安全性評估
-   - 擴展性分析
-   - 相關性評分
-   - 實作規劃
-3. 複製最佳匹配作為基礎
-4. 在經過驗證的結構中迭代