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-CN/rules/python/patterns.md

@@ -1,34 +0,0 @@
-# Python 模式
-
-> 本文档扩展了 [common/patterns.md](../common/patterns.md)，补充了 Python 特定的内容。
-
-## 协议（鸭子类型）
-
-```python
-from typing import Protocol
-
-class Repository(Protocol):
-    def find_by_id(self, id: str) -> dict | None: ...
-    def save(self, entity: dict) -> dict: ...
-```
-
-## 数据类作为 DTO
-
-```python
-from dataclasses import dataclass
-
-@dataclass
-class CreateUserRequest:
-    name: str
-    email: str
-    age: int | None = None
-```
-
-## 上下文管理器与生成器
-
-* 使用上下文管理器（`with` 语句）进行资源管理
-* 使用生成器进行惰性求值和内存高效迭代
-
-## 参考
-
-查看技能：`python-patterns`，了解包括装饰器、并发和包组织在内的综合模式。