Add database seeding functionality and enhance model relationships

- Implement initial data seeding for plans in the database.
- Create a new `seed_all_data` function to manage seeding process.
- Update `Sound` and `User` models to include relationships for `SoundPlayed` and `Stream`.

app/models/user.py

@@ -8,6 +8,8 @@ from app.models.base import BaseModel
 if TYPE_CHECKING:
     from app.models.plan import Plan
     from app.models.playlist import Playlist
+    from app.models.sound_played import SoundPlayed
+    from app.models.stream import Stream
     from app.models.user_oauth import UserOauth
 
 
@@ -29,3 +31,5 @@ class User(BaseModel, table=True):
     oauths: list["UserOauth"] = Relationship(back_populates="user")
     plan: "Plan" = Relationship(back_populates="users")
     playlists: list["Playlist"] = Relationship(back_populates="user")
+    sounds_played: list["SoundPlayed"] = Relationship(back_populates="user")
+    streams: list["Stream"] = Relationship(back_populates="user")