Update .pr_agent.toml to change model reference and remove unused configurations

- Updated the model reference to use the new openrouter path.
- Removed unnecessary configurations related to language support, review prompts, and file type filters for clarity.

Author: manhinhang

.pr_agent.toml

@@ -1,44 +1,3 @@
-[config] # in configuration.toml 
-model="deepseek/deepseek-r1-0528-qwen3-8b:free"
+[config]
+model="openrouter/deepseek/deepseek-r1-0528-qwen3-8b:free"
 fallback_models=["openrouter/deepseek/deepseek-r1-0528:free"]
-custom_model_max_tokens=20000
-
-[pr-agent]
-# 使用中文回复
-language = "zh"
-enable_synchronize = true
-force_review = true
-
-[pr-agent.prompts]
-# 自定义PR评论提示
-review_prompt = """
-请以中文回复，对以下PR进行代码审查：
-
-1. 代码质量和最佳实践
-2. 潜在的安全问题
-3. 性能优化建议
-4. 可读性和维护性
-5. 测试覆盖建议
-
-请提供具体、有建设性的反馈。
-"""
-
-[pr-agent.review]
-# 评论设置
-comment_lgtm = false
-enable_auto_approval = false
-enable_auto_merge = false
-
-[pr-agent.path_filters]
-# 文件类型过滤
-include_patterns = [
-    "**/*.py",
-    "**/*.js", 
-    "**/*.ts",
-    "**/*.yml",
-    "**/*.yaml",
-    "**/*.json",
-    "**/*.md",
-    "**/*.dockerfile",
-    "**/Dockerfile"
-]