feat(db): add performance entries and game platform support schemas

- Create performanceEntries table with FPS metrics, environment details,
  feature flags (FSR, frame gen), load times, settings JSON, and moderation
- Create gamePlatformSupport table with Proton/anti-cheat status enums
  and composite unique constraint on (gameId, hardwareSlug)
- Update schema barrel export to include both new tables

lib/db/schema/index.ts

@@ -2,6 +2,5 @@
 export * from "./games"
 export * from "./gameVersions"
 export * from "./hardware"
-// TODO: uncomment when files are created in Chunk 3
-// export * from "./performanceEntries"
-// export * from "./gamePlatformSupport"
+export * from "./performanceEntries"
+export * from "./gamePlatformSupport"