refactor(cleanup): 清理第二轮非酷狗组件残留（PlaylistSelection/NeteaseUpload/BilibiliIframe）

- RequestForm.vue：删除 PlaylistSelectionModal.vue / NeteaseUploadDialog.vue 2 行无效 import
  （2 组件在合并阶段已物理删除，grep 确认无 ref / 赋值 / template 渲染段残留）
- AudioPlayer.vue：彻底清理 BilibiliIframeModal 相关 8 处残留：
  ① 封面点击事件 @click 三元嵌套语法 bug 修复 → 简化为 !isMobile ? toggleLyrics()
  ② 删除 v-if=false 的「观看视频」Icon 按钮（保留歌词按钮）
  ③ 删除 ClientOnly 包裹的 BilibiliIframeModal 渲染段
  ④ 删除 BilibiliIframeModal.vue / getBilibiliUrl 2 行 import
  ⑤ 删除 showBilibiliIframe ref 定义
  ⑥ 删除 resolveFallbackUrl 中 if(false) 包裹的 bilibili 死代码分支
  ⑦ 删除整个 openBilibiliVideo 函数（含 iframe 预览 + 新窗口跳转逻辑）
  ⑧ handlePlayerClick 移动端逻辑简化为直接 toggleLyrics（移除 bilibili 平台分支）
- 验证：
  ・IDE GetDiagnostics 0 error / 0 warning
  ・grep 本轮 3 Modal 关键字在 app/components 下 0 命中（仅 utils/url.ts 保留 getBilibiliUrl
    工具函数定义，未被 import，不影响 build）
  ・上一轮 4 Modal（NeteaseLogin/PodcastEpisodes/BilibiliEpisodes/RecentSongs）
    grep 0 命中（持续干净）

app/components/Songs/RequestForm.vue

@@ -849,9 +849,7 @@ import Icon from '../UI/Icon.vue'
 import { convertToHttps, validateUrl } from '~/utils/url'
 
 import ImportSongsModal from './ImportSongsModal.vue'
-import PlaylistSelectionModal from './PlaylistSelectionModal.vue'
 import UserSearchModal from '../Common/UserSearchModal.vue'
-import NeteaseUploadDialog from './NeteaseUploadDialog.vue'
 
 const props = defineProps({
   loading: {

app/components/UI/AudioPlayer.vue

@@ -26,13 +26,7 @@
           <!-- 封面 -->
           <div
             class="cover-container"
-            @click.stop="
-              isMobile
-                ? false
-                  ? openBilibiliVideo()
-                  : toggleLyrics()
-                : null
-            "
+            @click.stop="!isMobile ? toggleLyrics() : null"
           >
             <template v-if="activeSong && activeSong.cover && !coverError">
               <img
@@ -107,15 +101,7 @@
           <!-- 控制按钮区域 -->
           <div class="controls-frame">
             <!-- 左侧歌词按钮 -->
-            <span
-              v-if="false"
-              class="lyrics-btn music-icon"
-              title="观看视频"
-              @click="openBilibiliVideo"
-            >
-              <Icon name="video" size="20" />
-            </span>
-            <span v-else class="lyrics-btn music-icon" title="歌词" @click="toggleLyrics">
+            <span class="lyrics-btn music-icon" title="歌词" @click="toggleLyrics">
               <Icon name="music" size="20" />
             </span>
 
@@ -210,16 +196,6 @@
       <LyricsModal :is-visible="showFullscreenLyrics" @close="showFullscreenLyrics = false" />
     </ClientOnly>
 
-    <!-- 哔哩哔哩 iframe 预览模态 -->
-    <ClientOnly>
-      <BilibiliIframeModal
-        :show="showBilibiliIframe"
-        :bvid="activeSong?.musicId?.split(':')[0]"
-        :page="activeSong?.musicId?.split(':')[2] ? parseInt(activeSong.musicId.split(':')[2]) : 1"
-        @close="showBilibiliIframe = false"
-      />
-    </ClientOnly>
-
     <ConfirmDialog
       :show="showFallbackOpenDialog"
       title="打开投稿链接"
@@ -238,7 +214,6 @@ import { computed, nextTick, onMounted, onUnmounted, ref, watch } from 'vue'
 import AppleMusicLyrics from './AppleMusicLyrics.vue'
 import LyricsModal from './LyricsModal.vue'
 import AudioElement from './AudioPlayer/AudioElement.vue'
-import BilibiliIframeModal from './BilibiliIframeModal.vue'
 import Icon from './Icon.vue'
 import ConfirmDialog from './ConfirmDialog.vue'
 import { useAudioPlayerControl } from '~/composables/useAudioPlayerControl'
@@ -246,7 +221,6 @@ import { useAudioPlayerSync } from '~/composables/useAudioPlayerSync'
 import { useAudioQuality } from '~/composables/useAudioQuality'
 import { useAudioPlayerEnhanced } from '~/composables/useAudioPlayerEnhanced'
 import { useMediaSession } from '~/composables/useMediaSession'
-import { getBilibiliUrl } from '~/utils/url'
 
 // 添加 router 导入
 const router = useRouter()
@@ -286,7 +260,6 @@ const showLyrics = ref(false)
 const showFullscreenLyrics = ref(false)
 const coverError = ref(false)
 const useAppleMusicStyle = ref(true) // 默认使用Apple Music风格
-const showBilibiliIframe = ref(false) // 显示哔哩哔哩 iframe 预览
 
 // 时长显示模式：'remaining' 显示剩余时长，'total' 显示总时长
 const timeDisplayMode = ref('remaining')
@@ -367,13 +340,6 @@ const resolveFallbackUrl = () => {
   const playUrl = normalizeHttpUrl(song.playUrl)
   if (playUrl) return playUrl
 
-  if (false) {
-    const bilibiliUrl = getBilibiliUrl(song)
-    if (bilibiliUrl && bilibiliUrl !== '#') {
-      return bilibiliUrl
-    }
-  }
-
   return null
 }
 
@@ -962,23 +928,6 @@ const toggleLyrics = () => {
   showFullscreenLyrics.value = true
 }
 
-const openBilibiliVideo = () => {
-  const song = activeSong.value
-  if (!song) return
-
-  // 如果播放器有错误，显示 iframe 预览
-  if (control.hasError.value) {
-    showBilibiliIframe.value = true
-    return
-  }
-
-  // 否则在新窗口打开
-  const url = getBilibiliUrl(song)
-  if (url && url !== '#') {
-    window.open(url, '_blank')
-  }
-}
-
 const handleLyricSeek = async (time) => {
   // 如果当前处于暂停状态，先开始播放
   if (!control.isPlaying.value) {
@@ -1152,11 +1101,7 @@ const checkMobile = () => {
 // 移动端点击播放条处理
 const handlePlayerClick = () => {
   if (isMobile.value) {
-    if (activeSong.value?.musicPlatform === 'bilibili') {
-      openBilibiliVideo()
-    } else {
-      toggleLyrics()
-    }
+    toggleLyrics()
   }
 }