update add_video route and change queue method

- change add to queue method from `GET` on `/` to `POST` on `/queue`
- update `/add_video` route to accept single video url

requirements.txt

@@ -1,4 +1,5 @@
 alembic==1.14.1
+bleach==6.2.0
 blinker==1.9.0
 cffi==1.17.1
 click==8.1.7
@@ -17,4 +18,6 @@ pycparser==2.22
 PyMySQL==1.1.1
 SQLAlchemy==2.0.38
 typing_extensions==4.12.2
+webencodings==0.5.1
 Werkzeug==3.1.3
+yt-dlp==2025.2.19