perf(8502): 并行生图(6并发)+超时重试；视频URL直连预览/下载；路径隔离

modules/factory.py

@@ -697,8 +697,12 @@ def generate_voiceover_volcengine_long(
     
     # 生成每段音频
     chunk_files = []
+    # Keep temp artifacts near output_path when provided to avoid cross-project collisions
+    base_tmp_dir = Path(output_path).parent if output_path else config.TEMP_DIR
+    base_tmp_dir.mkdir(parents=True, exist_ok=True)
     for i, chunk in enumerate(chunks):
-        chunk_path = str(config.TEMP_DIR / f"vo_chunk_{i}_{int(time.time())}.mp3")
+        import uuid
+        chunk_path = str(base_tmp_dir / f"vo_chunk_{i}_{int(time.time() * 1000)}_{uuid.uuid4().hex[:8]}.mp3")
         try:
             path = generate_voiceover_volcengine(
                 text=chunk,
@@ -723,13 +727,14 @@ def generate_voiceover_volcengine_long(
         return chunk_files[0]
     
     # 创建合并文件列表
-    concat_list = config.TEMP_DIR / f"concat_audio_{os.getpid()}.txt"
+    import uuid
+    concat_list = base_tmp_dir / f"concat_audio_{int(time.time() * 1000)}_{uuid.uuid4().hex[:8]}.txt"
     with open(concat_list, "w") as f:
         for cf in chunk_files:
             f.write(f"file '{cf}'\n")
     
     if not output_path:
-        output_path = str(config.TEMP_DIR / f"vo_volc_merged_{int(time.time())}.mp3")
+        output_path = str(base_tmp_dir / f"vo_volc_merged_{int(time.time() * 1000)}_{uuid.uuid4().hex[:8]}.mp3")
     
     # FFmpeg 合并
     import subprocess