hoàn thành tính năng mp3 player

backend/app/schemas.py

@@ -98,6 +98,26 @@ class AnnotationIn(BaseModel):
     canvas_data: dict
 
 
+# ── Audio ─────────────────────────────────────────────────────────────────────
+
+class AudioOut(BaseModel):
+    id: int
+    pdf_id: int
+    track_name: str
+    page_number: int | None
+    sort_order: int
+    created_at: datetime
+
+    model_config = {"from_attributes": True}
+
+
+class AudioUploadResult(BaseModel):
+    filename: str
+    success: bool
+    audio: AudioOut | None = None
+    error: str | None = None
+
+
 class AnnotationOut(BaseModel):
     id: int
     pdf_id: int