fix: 修复代码审查全部18项问题，重构导出与匹配引擎

A级(严重):
- ExportResults 支持 CSV 格式导出和 IncludeHeader 配置，使用实际表头名
- RunMatchWithAI 消除重复文件读取，提取 runMatchOnData() 内部函数
- AI 缓存文件权限收紧至 0600

B级(中等):
- 移除废弃代码约400行 (MonthlyReport/DailyReport/StartMatching/DeepseekEnhanceMatching)
- 替换自定义 parseCSVLine 为标准 encoding/csv
- GetAICacheInfo 返回命名结构体 AICacheInfo
- 时间差排序改为数值比较
- App.vue 提取 buildMatchConfig() 工厂函数消除配置重复
- AllMatches=false 时命中 1.0 相似度可提前结束 B 表循环

C级(轻微):
- 魔法数字提取为命名常量
- main.go 替换 println 为 log.Fatalf
- 清理未使用变量

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

frontend/src/App.vue

@@ -126,28 +126,32 @@ async function startMatching() {
   progress.value = { current: 0, total: 100, message: '准备中...', phase: 'reading' }
 
   try {
-    const config = {
-      fileAPath: fileAPath.value, fileBPath: fileBPath.value,
-      colAMatchIndex: colAMatchIdx.value, colATimeIndex: colATimeIdx.value,
-      colBMatchIndex: colBMatchIdx.value, colBTimeIndex: colBTimeIdx.value,
-      colBExtractIndex: colBExtractIdx.value,
-      regexPattern: matchConfig.value.regexPattern || '',
-      timeWindow: Number(matchConfig.value.timeWindow) || 12,
-      threshold: Number(matchConfig.value.threshold) || 0.65,
-      allMatches: matchConfig.value.allMatches || false,
-      caseSensitive: matchConfig.value.caseSensitive || false,
-      sortBy: matchConfig.value.sortBy || '',
-      maxPreview: Number(matchConfig.value.maxPreview) || 0,
-      exportFormat: matchConfig.value.exportFormat || 'xlsx',
-      includeHeader: matchConfig.value.includeHeader !== false
-    }
-    const data = await RunMatch(config)
+    const data = await RunMatch(buildMatchConfig())
     results.value = data; stats.value.matched = data.length
   } catch (err) { errorMsg.value = typeof err === 'string' ? err : (err.message || '匹配失败')
     hideProgressNow()
   } finally { loading.value = false; if (!errorMsg.value) scheduleProgressDone() }
 }
 
+// buildMatchConfig 从响应式状态构建 MatchConfig 对象（消除重复）
+function buildMatchConfig() {
+  return {
+    fileAPath: fileAPath.value, fileBPath: fileBPath.value,
+    colAMatchIndex: colAMatchIdx.value, colATimeIndex: colATimeIdx.value,
+    colBMatchIndex: colBMatchIdx.value, colBTimeIndex: colBTimeIdx.value,
+    colBExtractIndex: colBExtractIdx.value,
+    regexPattern: matchConfig.value.regexPattern || '',
+    timeWindow: Number(matchConfig.value.timeWindow) || 12,
+    threshold: Number(matchConfig.value.threshold) || 0.65,
+    allMatches: matchConfig.value.allMatches || false,
+    caseSensitive: matchConfig.value.caseSensitive || false,
+    sortBy: matchConfig.value.sortBy || '',
+    maxPreview: Number(matchConfig.value.maxPreview) || 0,
+    exportFormat: matchConfig.value.exportFormat || 'xlsx',
+    includeHeader: matchConfig.value.includeHeader !== false
+  }
+}
+
 // ----------- Deepseek AI 增强匹配 -----------
 async function startAIEnhance() {
   if (!fileAPath.value || !fileBPath.value) {
@@ -179,22 +183,7 @@ async function startAIEnhance() {
   progress.value = { current: 0, total: 100, message: '正在启动 AI 增强匹配...', phase: 'reading' }
 
   try {
-    const config = {
-      fileAPath: fileAPath.value, fileBPath: fileBPath.value,
-      colAMatchIndex: colAMatchIdx.value, colATimeIndex: colATimeIdx.value,
-      colBMatchIndex: colBMatchIdx.value, colBTimeIndex: colBTimeIdx.value,
-      colBExtractIndex: colBExtractIdx.value,
-      regexPattern: matchConfig.value.regexPattern || '',
-      timeWindow: Number(matchConfig.value.timeWindow) || 12,
-      threshold: Number(matchConfig.value.threshold) || 0.65,
-      allMatches: matchConfig.value.allMatches || false,
-      caseSensitive: matchConfig.value.caseSensitive || false,
-      sortBy: matchConfig.value.sortBy || '',
-      maxPreview: Number(matchConfig.value.maxPreview) || 0,
-      exportFormat: matchConfig.value.exportFormat || 'xlsx',
-      includeHeader: matchConfig.value.includeHeader !== false
-    }
-    const data = await RunMatchWithAI(config)
+    const data = await RunMatchWithAI(buildMatchConfig())
     results.value = data
     stats.value.matched = data.length
   } catch (err) {

main.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"embed"
+	"log"
 
 	"github.com/wailsapp/wails/v2"
 	"github.com/wailsapp/wails/v2/pkg/options"
@@ -41,6 +42,6 @@ func main() {
 	})
 
 	if err != nil {
-		println("Error:", err.Error())
+		log.Fatalf("应用启动失败: %v", err)
 	}
 }