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

🤖 Generated with [Qoder][https://qoder.com]

knowledge/router.py

@@ -283,7 +283,7 @@ class KnowledgeBaseRouter:
         content = call_llm(
             self.llm_client, prompt, MODEL,
             temperature=0.1,
-            max_tokens=100
+            max_tokens=512
         )
 
         if content is None: