fix: 前端内存泄漏与 CLI 健壮性

- ImportMusicModal：watch + revokeObjectURL 防内存泄漏\n- MusicList：fetch 加 res.ok 检查\n- InfoCommand：数组越界保护\n- DebugCommand：异常返回 1 而非 throw 崩溃

Author: Applesaber

ChuChartManager.CLI/Commands/DebugCommand.cs

@@ -30,7 +30,7 @@ public override int Execute(CommandContext context)
         if (exception != null)
         {
             Console.Error.WriteLine($"发生错误: {exception}");
-            throw exception;
+            return 1;
         }
         return 0;
     }

ChuChartManager.CLI/Commands/InfoCommand.cs

@@ -62,7 +62,7 @@ public override int Execute(CommandContext context, Settings settings)
 
         for (int i = 0; i < 6; i++)
         {
-            var f = music.Fumens[i];
+            var f = i < music.Fumens.Length ? music.Fumens[i] : null;
             if (f == null)
             {
                 table.AddRow(DiffNames[i], "-", "-", "否");

ChuChartManager/Front/src/views/ImportMusicModal.vue

@@ -1,5 +1,5 @@
 <script setup lang="ts">
-import { ref, computed, onMounted } from 'vue'
+import { ref, computed, watch, onMounted, onUnmounted } from 'vue'
 import { useI18n } from 'vue-i18n'
 import { Button, TextInput, NumberInput, Select, Modal, addToast } from '@munet/ui'
 import { getGenreMap, getSources, importMusicCheck, importMusicExecute } from '@/api'
@@ -31,7 +31,27 @@ const genreMap = ref<Record<number, string>>({})
 const sources = ref<string[]>([])
 
 const showForm = computed(() => step.value === 'form' || step.value === 'executing')
-const coverUrl = computed(() => coverFile.value ? URL.createObjectURL(coverFile.value) : '')
+const coverUrl = ref('')
+
+let currentCoverUrl: string | null = null
+watch(coverFile, (file) => {
+  if (currentCoverUrl) {
+    URL.revokeObjectURL(currentCoverUrl)
+    currentCoverUrl = null
+  }
+  if (file) {
+    currentCoverUrl = URL.createObjectURL(file)
+    coverUrl.value = currentCoverUrl
+  } else {
+    coverUrl.value = ''
+  }
+})
+
+onUnmounted(() => {
+  if (currentCoverUrl) {
+    URL.revokeObjectURL(currentCoverUrl)
+  }
+})
 
 const genreOptions = computed(() =>
   Object.entries(genreMap.value).map(([id, name]) => ({ label: name, value: Number(id) }))

ChuChartManager/Front/src/views/MusicList.vue

@@ -220,6 +220,7 @@ async function exportToFolder(url: string) {
 
   try {
     const res = await fetch(url)
+    if (!res.ok) throw new Error(`HTTP ${res.status}: ${res.statusText}`)
     const zipReader = new ZipReader(res.body!)
     try {
       const entries = zipReader.getEntriesGenerator()