chore: 配置集中化、LLM 参数调整与 gitignore 更新

- config.example: 新增 MINERU_PREFER_V2、标题规则引擎、表单二次校正等配置项
- document_routes: DEV_MODE 判断统一收归 config.py
- llm_utils: quick_yes_no max_tokens 10→128，避免截断过短回答
- knowledge/router: 路由 LLM 调用 max_tokens 100→512
- feedback: 反馈分析 LLM 调用 max_tokens 200→512
- .gitignore: 新增 scripts/ 和 plans/ 目录忽略规则

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core/llm_utils.py

@@ -352,7 +352,7 @@ def quick_yes_no(
     if keywords is None:
         keywords = ["是", "需要", "yes", "true"]
 
-    result = call_llm(client, prompt, model, temperature=0, max_tokens=10)
+    result = call_llm(client, prompt, model, temperature=0, max_tokens=128)
     if result is None:
         return False