refactor: 优化流式输出与状态管理

- 重构 DeepSeekAPI.js，实现稳健的 SSE 流式解析
- 将核心业务逻辑（生成、分析）移入 appStore.js
- 优化 WriterPanel 和 AnalysisPanel 组件，移除冗余逻辑
- 更新文档，补充架构演进说明

src/components/AnalysisPanel.vue

@@ -203,81 +203,12 @@ const applyParadigm = (paradigm) => {
 
 // 分析文章
 const analyzeArticle = async () => {
-  if (!analysisText.value.trim()) {
-    alert('请输入要分析的文章内容')
-    return
-  }
-
-  isAnalyzing.value = true
-  appStore.analysisResult = {
-    paradigm: '分析中...',
-    paradigmType: null,
-    analysis: '',
-    timestamp: new Date()
-  }
-
   try {
-    const api = new DeepSeekAPI({ 
-      url: appStore.apiUrl, 
-      key: appStore.apiKey 
-    })
-    
-    const response = await api.analyzeContent(analysisText.value)
-    const reader = response.body.getReader()
-    const decoder = new TextDecoder()
-    
-    let fullContent = ''
-    
-    while (true) {
-      const { done, value } = await reader.read()
-      if (done) break
-      
-      const chunk = decoder.decode(value)
-      const lines = chunk.split('\n').filter(line => line.trim())
-      
-      for (const line of lines) {
-        if (line.startsWith('data: ')) {
-          const data = line.slice(6)
-          if (data === '[DONE]') continue
-          
-          try {
-            const parsed = JSON.parse(data)
-            const content = parsed.choices?.[0]?.delta?.content || ''
-            if (content) {
-              fullContent += content
-              // 实时更新分析结果
-              appStore.analysisResult = {
-                paradigm: '分析中...',
-                paradigmType: null,
-                analysis: fullContent,
-                timestamp: new Date()
-              }
-            }
-          } catch (e) {
-            // 忽略解析错误
-          }
-        }
-      }
-    }
-    
-    // 分析完成后检测范式类型
-    const detectedParadigm = detectParadigm(fullContent)
-    appStore.analysisResult = {
-      paradigm: detectedParadigm.name,
-      paradigmType: detectedParadigm.type,
-      analysis: fullContent,
-      timestamp: new Date()
-    }
-    
+    const result = await appStore.analyzeArticleAction(analysisText.value, detectParadigm)
     // 添加到历史记录
-    addToHistory(detectedParadigm.name, analysisText.value, fullContent)
+    addToHistory(result.paradigm, analysisText.value, result.content)
   } catch (error) {
-    appStore.analysisResult = {
-      error: true,
-      message: error.message
-    }
-  } finally {
-    isAnalyzing.value = false
+    alert(error.message)
   }
 }