Fix linting errors across backend and frontend

Backend: auto-fix and format all ruff issues, manually fix B904/B023/
SIM117/B007/E741/F841 errors, suppress B008 (FastAPI Depends) and F821
(SQLAlchemy forward refs) in config. Frontend: allow constant exports,
disable React compiler-specific rules (set-state-in-effect,
preserve-manual-memoization).

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

backend/src/app/models/game.py

@@ -12,7 +12,9 @@ class Game(Base):
     slug: Mapped[str] = mapped_column(String(100), unique=True)
     generation: Mapped[int] = mapped_column(SmallInteger)
     region: Mapped[str] = mapped_column(String(50))
-    category: Mapped[str | None] = mapped_column(String(20))  # original, remake, enhanced, sequel, spinoff
+    category: Mapped[str | None] = mapped_column(
+        String(20)
+    )  # original, remake, enhanced, sequel, spinoff
     box_art_url: Mapped[str | None] = mapped_column(String(500))
     release_year: Mapped[int | None] = mapped_column(SmallInteger)
     color: Mapped[str | None] = mapped_column(String(7))  # Hex color e.g. #FF0000
@@ -20,9 +22,7 @@ class Game(Base):
         ForeignKey("version_groups.id"), index=True
     )
 
-    version_group: Mapped["VersionGroup | None"] = relationship(
-        back_populates="games"
-    )
+    version_group: Mapped["VersionGroup | None"] = relationship(back_populates="games")
     runs: Mapped[list["NuzlockeRun"]] = relationship(back_populates="game")
 
     def __repr__(self) -> str: