feature/boss-sprites-and-badges (#22)

Reviewed-on: TheFurya/nuzlocke-tracker#22
Co-authored-by: Julian Tabel <juliantabel.jt@gmail.com>
Co-committed-by: Julian Tabel <juliantabel.jt@gmail.com>

backend/src/app/models/boss_battle.py

@@ -33,9 +33,13 @@ class BossBattle(Base):
     location: Mapped[str] = mapped_column(String(200))
     section: Mapped[str | None] = mapped_column(String(100), default=None)
     sprite_url: Mapped[str | None] = mapped_column(String(500))
+    game_id: Mapped[int | None] = mapped_column(
+        ForeignKey("games.id"), index=True, default=None
+    )
 
     version_group: Mapped["VersionGroup"] = relationship(back_populates="boss_battles")
     after_route: Mapped["Route | None"] = relationship()
+    game: Mapped["Game | None"] = relationship()
     pokemon: Mapped[list["BossPokemon"]] = relationship(
         back_populates="boss_battle", cascade="all, delete-orphan"
     )