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.

ui/chat_view.py

@@ -1,6 +1,6 @@
 """
 聊天视图组件
-处理普通对话的 UI 展示
+处理普通对话的 UI 展示 - 支持流式消息
 """
 
 import tkinter as tk
@@ -16,6 +16,7 @@ class ChatView:
     - 消息显示区域
     - 输入框
     - 发送按钮
+    - 流式消息支持
     """
     
     def __init__(
@@ -33,6 +34,10 @@ class ChatView:
         self.parent = parent
         self.on_send = on_send
         
+        # 流式消息状态
+        self._stream_active = False
+        self._stream_tag = None
+        
         self._create_widgets()
     
     def _create_widgets(self):
@@ -71,6 +76,7 @@ class ChatView:
         self.message_area.tag_configure('assistant', foreground='#81c784', font=('Microsoft YaHei UI', 11))
         self.message_area.tag_configure('system', foreground='#ffb74d', font=('Microsoft YaHei UI', 10, 'italic'))
         self.message_area.tag_configure('error', foreground='#ef5350', font=('Microsoft YaHei UI', 10))
+        self.message_area.tag_configure('streaming', foreground='#81c784', font=('Microsoft YaHei UI', 11))
         
         # 输入区域框架
         input_frame = tk.Frame(self.frame, bg='#1e1e1e')
@@ -147,6 +153,55 @@ class ChatView:
         self.message_area.see(tk.END)
         self.message_area.config(state=tk.DISABLED)
     
+    def start_stream_message(self, tag: str = 'assistant'):
+        """
+        开始流式消息
+        
+        Args:
+            tag: 消息类型
+        """
+        self._stream_active = True
+        self._stream_tag = tag
+        
+        self.message_area.config(state=tk.NORMAL)
+        
+        # 添加前缀
+        prefix_map = {
+            'user': '[你] ',
+            'assistant': '[助手] ',
+            'system': '[系统] ',
+            'error': '[错误] '
+        }
+        prefix = prefix_map.get(tag, '')
+        
+        self.message_area.insert(tk.END, "\n" + prefix, tag)
+        self.message_area.see(tk.END)
+        # 保持 NORMAL 状态以便追加内容
+    
+    def append_stream_chunk(self, chunk: str):
+        """
+        追加流式消息片段
+        
+        Args:
+            chunk: 消息片段
+        """
+        if not self._stream_active:
+            return
+        
+        self.message_area.insert(tk.END, chunk, self._stream_tag)
+        self.message_area.see(tk.END)
+        # 强制更新 UI
+        self.message_area.update_idletasks()
+    
+    def end_stream_message(self):
+        """结束流式消息"""
+        if self._stream_active:
+            self.message_area.insert(tk.END, "\n")
+            self.message_area.see(tk.END)
+            self.message_area.config(state=tk.DISABLED)
+            self._stream_active = False
+            self._stream_tag = None
+    
     def clear_messages(self):
         """清空消息区域"""
         self.message_area.config(state=tk.NORMAL)