refactor: update reflection proxies and improve JSON serialization for player stats

[ammodev]

No description provided.

[Copilot]

Pull request overview

Refactors the Paper server-side reflection/NMS bridges to align with updated Minecraft internals: player stats JSON is now produced via JsonElement + Gson, and item component mutation is done via registry holder binding instead of a custom reflection proxy.

Changes:

• Update ServerStatsCounterProxy.toJson to return a JsonElement and expose the underlying static GSON via a reflection-remapper @FieldGetter.
• Remove the custom ItemProxy reflection abstraction and update item component updates to use builtInRegistryHolder().bindComponents(...).
• Bump project version to 26.1.1-3.0.3.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
surf-api-paper/surf-api-paper-server/src/main/kotlin/dev/slne/surf/api/paper/server/reflection/ServerStatsCounterProxy.kt	Adjust stats JSON proxy to return JsonElement and add static GSON access.
surf-api-paper/surf-api-paper-server/src/main/kotlin/dev/slne/surf/api/paper/server/reflection/Reflection.kt	Remove ITEM_PROXY wiring from the central reflection registry.
surf-api-paper/surf-api-paper-server/src/main/kotlin/dev/slne/surf/api/paper/server/reflection/ItemProxy.kt	Delete obsolete reflection proxy for mutating Item.components.
surf-api-paper/surf-api-paper-server/src/main/kotlin/dev/slne/surf/api/paper/server/impl/nms/bridges/SurfPaperNmsStatsBridgeImpl.kt	Serialize player stats by converting JsonElement to String with the server’s Gson.
surf-api-paper/surf-api-paper-server/src/main/kotlin/dev/slne/surf/api/paper/server/impl/nms/bridges/SurfPaperNmsItemBridgeImpl.kt	Switch item component mutation to bindComponents instead of reflection-based field mutation.
gradle.properties	Increment version to 26.1.1-3.0.3.