fix: 修复 endpoints 模块导入路径

- progress.py: get_db, get_current_user 从 app.core.deps 导入
- speech.py: 同上
- recommendation.py: 同上

backend/app/api/v1/endpoints/progress.py

@@ -8,8 +8,7 @@ from sqlalchemy.ext.asyncio import AsyncSession
 from sqlalchemy import select, func, and_
 from pydantic import BaseModel, Field
 
-from app.core.database import get_db
-from app.api.deps import get_current_user
+from app.core.deps import get_db, get_current_user
 from app.models.user import User
 from app.models.course import Course, CourseMaterial
 from app.models.user_course_progress import (