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/route_encounter.py

@@ -8,8 +8,11 @@ class RouteEncounter(Base):
     __tablename__ = "route_encounters"
     __table_args__ = (
         UniqueConstraint(
-            "route_id", "pokemon_id", "encounter_method", "game_id",
-            name="uq_route_pokemon_method_game"
+            "route_id",
+            "pokemon_id",
+            "encounter_method",
+            "game_id",
+            name="uq_route_pokemon_method_game",
         ),
     )