feat: 풀스택 할일관리 앱 구현 (통합 모달 + 간트차트)

- Backend: FastAPI + MongoDB + Redis (카테고리, 할일 CRUD, 파일 첨부, 검색, 대시보드)
- Frontend: Next.js 15 + Tailwind + React Query + Zustand
- 통합 TodoModal: 생성/수정 모달 통합, 탭 구조 (기본/태그와 첨부)
- 간트차트: 카테고리별 할일 타임라인 시각화
- TodoCard: 제목/카테고리/우선순위/태그/첨부 한줄 표시
- Docker Compose 배포 (Frontend:3010, Backend:8010, MongoDB:27021, Redis:6391)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/app/routers/todos.py

@@ -0,0 +1,106 @@
+from typing import Optional
+
+from fastapi import APIRouter, Depends, Query, Response, status
+
+from app.database import get_database, get_redis
+from app.models.todo import (
+    TodoCreate,
+    TodoUpdate,
+    TodoResponse,
+    TodoListResponse,
+    BatchRequest,
+    BatchResponse,
+    ToggleResponse,
+)
+from app.services.todo_service import TodoService
+
+router = APIRouter(prefix="/api/todos", tags=["todos"])
+
+
+def _get_service(
+    db=Depends(get_database),
+    redis=Depends(get_redis),
+) -> TodoService:
+    return TodoService(db, redis)
+
+
+# 중요: /batch를 /{id} 보다 위에 등록
+@router.post("/batch", response_model=BatchResponse)
+async def batch_action(
+    data: BatchRequest,
+    service: TodoService = Depends(_get_service),
+):
+    """F-019~F-021: 일괄 작업 (완료/삭제/카테고리 변경)"""
+    return await service.batch_action(data)
+
+
+@router.get("", response_model=TodoListResponse)
+async def list_todos(
+    page: int = Query(1, ge=1, description="페이지 번호"),
+    limit: int = Query(20, ge=1, le=100, description="페이지당 항목 수"),
+    completed: Optional[bool] = Query(None, description="완료 상태 필터"),
+    category_id: Optional[str] = Query(None, description="카테고리 필터"),
+    priority: Optional[str] = Query(None, description="우선순위 필터 (high/medium/low)"),
+    tag: Optional[str] = Query(None, description="태그 필터"),
+    sort: str = Query("created_at", description="정렬 기준 (created_at/due_date/priority)"),
+    order: str = Query("desc", description="정렬 방향 (asc/desc)"),
+    service: TodoService = Depends(_get_service),
+):
+    """F-002: 할일 목록 조회 (필터/정렬/페이지네이션)"""
+    return await service.list_todos(
+        page=page,
+        limit=limit,
+        completed=completed,
+        category_id=category_id,
+        priority=priority,
+        tag=tag,
+        sort=sort,
+        order=order,
+    )
+
+
+@router.post("", response_model=TodoResponse, status_code=status.HTTP_201_CREATED)
+async def create_todo(
+    data: TodoCreate,
+    service: TodoService = Depends(_get_service),
+):
+    """F-001: 할일 생성"""
+    return await service.create_todo(data)
+
+
+@router.get("/{todo_id}", response_model=TodoResponse)
+async def get_todo(
+    todo_id: str,
+    service: TodoService = Depends(_get_service),
+):
+    """F-003: 할일 상세 조회"""
+    return await service.get_todo(todo_id)
+
+
+@router.put("/{todo_id}", response_model=TodoResponse)
+async def update_todo(
+    todo_id: str,
+    data: TodoUpdate,
+    service: TodoService = Depends(_get_service),
+):
+    """F-004: 할일 수정"""
+    return await service.update_todo(todo_id, data)
+
+
+@router.delete("/{todo_id}", status_code=status.HTTP_204_NO_CONTENT)
+async def delete_todo(
+    todo_id: str,
+    service: TodoService = Depends(_get_service),
+):
+    """F-005: 할일 삭제"""
+    await service.delete_todo(todo_id)
+    return Response(status_code=status.HTTP_204_NO_CONTENT)
+
+
+@router.patch("/{todo_id}/toggle", response_model=ToggleResponse)
+async def toggle_todo(
+    todo_id: str,
+    service: TodoService = Depends(_get_service),
+):
+    """F-006: 할일 완료 토글"""
+    return await service.toggle_todo(todo_id)