重构: 巨函数拆分 + 清理历史标记注释 + custom_prompt/停止按钮/tunnel 改进

src/i18n/en/settings.ts

@@ -137,6 +137,10 @@ export default {
     labelShowTokenUsage: 'Show token usage',
     descShowTokenUsage: 'Show token consumption of each reply in conversations',
 
+    labelCustomPrompt: 'Custom prompt',
+    descCustomPrompt: 'Appended to the AI system prompt to customize AI behavior',
+    placeholderCustomPrompt: 'e.g.: You specialize in Rust development questions...',
+
     labelStreamingMd: 'Streaming Markdown rendering',
     descStreamingMd: 'Render code blocks/lists/headings during streaming (unclosed code blocks degrade to plain text to avoid flicker); when off, only plain text is shown during streaming and full formatting applies after generation completes',
 

src/i18n/zh-CN/settings.ts

@@ -137,6 +137,10 @@ export default {
     labelShowTokenUsage: '显示 Token 用量',
     descShowTokenUsage: '在对话中展示每次回复的 token 消耗',
 
+    labelCustomPrompt: '自定义提示词',
+    descCustomPrompt: '追加到 AI 系统提示词末尾，可自定义 AI 行为偏好',
+    placeholderCustomPrompt: '例如：你擅长回答 Rust 开发问题...',
+
     labelStreamingMd: '流式 Markdown 渲染',
     descStreamingMd: '流式生成过程中渲染代码块/列表/标题格式(未闭合代码块降级纯文本防闪烁);关闭后流式期间仅显纯文本,生成完成后才渲染完整格式',