feat: implement streaming support for chat and enhance safety review process

- Updated .env.example to include API key placeholder and configuration instructions.
- Refactored main.py to support streaming responses from the LLM, improving user experience during chat interactions.
- Enhanced LLMClient to include methods for streaming chat and collecting responses.
- Modified safety review process to pass static analysis warnings to the LLM for better code safety evaluation.
- Improved UI components in chat_view.py to handle streaming messages effectively.

.env.example

@@ -1,4 +1,16 @@
-LLM_API_URL=https://api.siliconflow.cn/v1/chat/completions
-LLM_API_KEY=sk-fxsxbgatrjjhsnjpkdfgfngukqoqqgitjpxfqfxifcipaqpc
+# ========================================
+# LocalAgent 閰嶇疆鏂囦欢绀轰緥
+# ========================================
+# 浣跨敤鏂规硶锛?# 1. 澶嶅埗姝ゆ枃浠朵负 .env
+# 2. 濉叆浣犵殑 API Key 鍜屽叾浠栭厤缃?# ========================================
+
+# SiliconFlow API 閰嶇疆
+# 鑾峰彇 API Key: https://siliconflow.cn
+LLM_API_URL=https://api.siliconflow.cn/v1/chat/completions
+LLM_API_KEY=your_api_key_here
+
+# 妯″瀷閰嶇疆
+# 鎰忓浘璇嗗埆妯″瀷锛堟帹鑽愪娇鐢ㄥ皬妯″瀷锛岄€熷害蹇級
 INTENT_MODEL_NAME=Qwen/Qwen2.5-7B-Instruct
-GENERATION_MODEL_NAME=Qwen/Qwen2.5-72B-Instruct
+
+# 浠ｇ爜鐢熸垚妯″瀷锛堟帹鑽愪娇鐢ㄥぇ妯″瀷锛屾晥鏋滃ソ锛?GENERATION_MODEL_NAME=Qwen/Qwen2.5-72B-Instruct