Initial commit: audio2text 双语字幕生成服务

- 音频/视频转双语(英/中)SRT 字幕，Docker 容器化，CPU 开发/GPU 生产同一份代码
- faster-whisper ASR(词级时间戳) + 断句时间戳重算 + NLLB 翻译(模型不共驻)
- 分片上传(断点续传) + SQLite 持久化 + 主页/历史/日志页面
- 历史页文件名搜索；缓存定时清理(默认保留7天，可配置)
- 双 Dockerfile(cpu/gpu) + setup/start/stop 脚本

app/controllers/upload_router.py

@@ -0,0 +1,69 @@
+"""分片上传路由：建会话 / 查状态 / 传分片 / complete。
+
+协议与 server 完全一致，区别仅在 complete 后创建的是转写 Task 而非 UploadedFile。
+"""
+
+from __future__ import annotations
+
+from fastapi import APIRouter, Depends, Request
+from sqlalchemy.orm import Session
+
+from ..database import get_db
+from ..schemas.task import (
+    ChunkUploadResponse,
+    CompleteResponse,
+    CreateSessionRequest,
+    CreateSessionResponse,
+    SessionStatusResponse,
+)
+from ..services.upload_service import UploadService
+
+router = APIRouter(prefix="/api/tasks/chunk-uploads", tags=["upload"])
+
+
+def _service(db: Session = Depends(get_db)) -> UploadService:
+    return UploadService(db)
+
+
+@router.post("", response_model=CreateSessionResponse, summary="创建分片上传会话")
+def create_session(
+    body: CreateSessionRequest,
+    service: UploadService = Depends(_service),
+) -> CreateSessionResponse:
+    return service.create_session(body)
+
+
+@router.get("/{upload_id}/status", response_model=SessionStatusResponse, summary="查询会话状态（断点续传）")
+def session_status(
+    upload_id: str,
+    service: UploadService = Depends(_service),
+) -> SessionStatusResponse:
+    return service.get_status(upload_id)
+
+
+@router.post("/{upload_id}/chunks/{index}", response_model=ChunkUploadResponse, summary="上传单个分片")
+async def upload_chunk(
+    upload_id: str,
+    index: int,
+    request: Request,
+    service: UploadService = Depends(_service),
+) -> ChunkUploadResponse:
+    uploaded = service.write_chunk(upload_id, index, await request.body())
+    return ChunkUploadResponse(upload_id=upload_id, index=index, uploaded_chunks=uploaded)
+
+
+@router.post("/{upload_id}/complete", response_model=CompleteResponse, summary="完成拼接并创建转写任务")
+def complete_session(
+    upload_id: str,
+    service: UploadService = Depends(_service),
+) -> CompleteResponse:
+    """拼接分片 + 创建转写任务 + 入队管线。
+
+    controller 负责编排：service.complete 只管存储（拼接 + 建 Task），
+    管线触发由 controller 调用，service 不依赖 pipeline（避免循环依赖）。
+    """
+    resp = service.complete(upload_id)
+    # 仅新建任务时入队（幂等 complete 返回的也是同一 task_id，enqueue 幂等无副作用）
+    from ..services.pipeline import enqueue_task
+    enqueue_task(resp.task_id)
+    return resp