config: remove Chinese docs from .gitignore to include in version control

� .gitignore Update:
- Remove docs/zh-CN/ from .gitignore
- Allow Chinese documentation to be included in version control
- Keep tests/ directory excluded as intended

� Rationale:
Chinese documentation provides value to the global community
and should be available to all users, not just local development.

.gitignore

@@ -8,9 +8,8 @@ eval_data/
 *.egg-info/
 .env
 
-# 测试和中文文档目录（不纳入版本控制）
+# 测试目录（不纳入版本控制）
 tests/
-docs/zh-CN/
 
 # 中文版本目录（不纳入版本控制）
 TradingAgentsCN/