fix(viral-video): fix 6 E2E bugs — fusion_level alias, concat silent segments, ingest lookup, duplicated URL, TTS voice/format, Seedance first-frame ratio

Bug1 (P0): schema accepts 'full_ai' as alias for 'ai_full' (Pydantic field_validator normalizes)
Bug2 (P0): concat_video_files probes each segment audio stream; Seedance gen_audio=False
       segments now marked has_audio=False so concat filter uses aevalsrc silence instead
       of failing with ffmpeg exit 234
Bug3 (P1): find_by_storage_key now queries (storage_key OR file_url) to cover historical
       data where the legacy file_url column held assets/<project>/<date>/... paths
Bug4 (P1): duplicated-hit response no longer accesses non-existent domain Asset.file_url;
       new helper _get_existing_asset_url uses storage_key (fallback file_url) through
       storage_service.get_url()
Bug5 (P1): _step_tts passes job.persona_id as voice_id (default longxiaochun_v3) and
       forces format='mp3' so downstream ffmpeg -map 1:a:0 works regardless of provider
Bug6 (P1): call_video_generation omits ratio param in first-frame (image_url) mode;
       ai_client.video_generation ratio becomes Optional[str] and is omitted from payload
       when None, fixing 400 InvalidParameter from Seedance

apps/api/app/api/routes/upload.py

@@ -191,6 +191,23 @@ def _find_duplicate_asset(
     return None
 
 
+
+def _get_existing_asset_url(existing: Any, storage_service: Any) -> str:
+    """安全获取已存在素材的公网 URL，兼容 domain Asset（无 file_url 字段）和 ORM model。"""
+    # Domain Asset 只有 storage_key 字段；ORM model 有 file_url 但存的也是 storage_key
+    key = ""
+    for attr in ("storage_key", "file_url"):
+        v = getattr(existing, attr, None)
+        if v:
+            key = v
+            break
+    if not key:
+        return ""
+    try:
+        return storage_service.get_url(key) or ""
+    except Exception:
+        return ""
+
 def _create_pending_asset(
     asset_repository,
     project_id,
@@ -390,7 +407,7 @@ async def prepare_direct_upload(
                 duplicated=True,
                 skip_transfer=True,
                 asset_id=existing.id,
-                url=existing.file_url or storage_service.get_url(existing.storage_key) or "",
+                url=_get_existing_asset_url(existing, storage_service),
             )
 
     file_id = uuid4().hex[:8]

apps/api/app/schemas/viral_video.py

@@ -8,7 +8,7 @@ from pydantic import BaseModel, Field, field_validator
 
 # ── 枚举常量 ─────────────────────────────────────────────────────────────
 
-VALID_FUSION_LEVELS = ("ai_full", "ai_polish", "user_primary")
+VALID_FUSION_LEVELS = ("ai_full", "full_ai", "ai_polish", "user_primary")
 VALID_STYLE_STRENGTHS = ("light", "medium", "strict")
 VALID_STAGES = (
     "image_analysis",
@@ -50,6 +50,9 @@ class CreateViralVideoRequest(BaseModel):
     @field_validator("fusion_level")
     @classmethod
     def _validate_fusion_level(cls, v: str) -> str:
+        # 兼容前端历史写法 full_ai（等价 ai_full）
+        if v == "full_ai":
+            return "ai_full"
         if v not in VALID_FUSION_LEVELS:
             raise ValueError(f"fusion_level 必须是 {VALID_FUSION_LEVELS} 之一")
         return v