fix: 上传的配音素材直接使用 file_url，不调 TTS 合成

- 配音预览逻辑优化：优先检查 selectedVoice 是否为已上传素材
- 如果是上传素材，直接使用其 file_url 作为预览音频
- 仅对预设音色或克隆音色调用 previewTts 接口合成
- 切换配音或标题时自动重新生成预览音频

解决用户反馈：Step3 选择上传的配音素材后预览无声音的问题

apps/web/src/pages/generate/GeneratePage.tsx

@@ -12,6 +12,7 @@ import React, { useMemo, useState, useEffect, useRef } from "react"
 import { Modal, message } from "antd"
 import { useNavigate } from "react-router-dom"
 import type { VoiceClone } from "@/api/voice-clone"
+import { useQuery } from "@tanstack/react-query"
 import { useCloneProgress } from "@/hooks/useCloneProgress"
 import CloneModal from "@/components/voice/CloneModal"
 import GenerateHeader from "./components/GenerateHeader"
@@ -29,6 +30,7 @@ import { useStepNavigation } from "./hooks/useStepNavigation"
 import { useGenerateVideo } from "./hooks/useGenerateVideo"
 import { usePreviewAssets } from "./hooks/usePreviewAssets"
 import { useTitleStyleUpdaters } from "./hooks/useStep4Title/useTitleStyleUpdaters"
+import { getAssetsByKind } from "@/api/assets"
 import { previewTts } from "@/api/tts"
 import "./generate.css"
 
@@ -88,19 +90,35 @@ const GeneratePage: React.FC = () => {
   })
 
   /* ── 配音预览音频（TTS 试听）── */
+  const { data: voiceMaterials = [] } = useQuery({
+    queryKey: ["assets", "voice"],
+    queryFn: () => getAssetsByKind("voice", { limit: 50 }),
+  })
+
   const [previewVoiceAudioUrl, setPreviewVoiceAudioUrl] = useState<string | null>(null)
   const ttsAbortRef = useRef<AbortController | null>(null)
 
   useEffect(() => {
+    // 如果 selectedVoice 是已上传的配音素材，直接用 file_url
+    const voiceAsset = voiceMaterials.find((m) => m.id === selectedVoice)
+    if (voiceAsset?.file_url) {
+      setPreviewVoiceAudioUrl(voiceAsset.file_url)
+      return
+    }
+
+    // 没有选中的 voice 或标题，跳过
     const voiceId = selectedClonedVoice || selectedVoice
     if (!voiceId || !titleSettings.title) {
       setPreviewVoiceAudioUrl(null)
       return
     }
+
+    // 预设音色 / 克隆音色 → 调 TTS 合成
     ttsAbortRef.current?.abort()
     const controller = new AbortController()
     ttsAbortRef.current = controller
     let cancelled = false
+
     previewTts({
       text: titleSettings.title,
       voice_id: voiceId,
@@ -116,12 +134,13 @@ const GeneratePage: React.FC = () => {
           setPreviewVoiceAudioUrl(null)
         }
       })
+
     return () => {
       cancelled = true
       controller.abort()
     }
     // eslint-disable-next-line react-hooks/exhaustive-deps
-  }, [selectedVoice, selectedClonedVoice, titleSettings.title])
+  }, [selectedVoice, selectedClonedVoice, titleSettings.title, voiceMaterials])
 
   /* ── 克隆声音 ── */
   const { clones: clonedVoices, addClone, hasProcessing } = useCloneProgress()