chore(controller): three-player-controller als Ordner statt Submodul

Das Submodul zeigte auf GitHub, der eingetragene Stand 028c652 lag aber nur
lokal vor: GitHub-Master ac39682 plus Showcase mit Figuren und launch.json.
Frische Klone konnten den Controller deshalb nicht laden. Jetzt liegt dieser
Stand als normaler Ordner im Repo, ohne Verweis auf GitHub.

dist/ und node_modules/ im Controller bleiben ignoriert und werden wie bisher
lokal gebaut.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

three-player-controller/src/index.ts

@@ -0,0 +1,55 @@
+// 主入口
+export * from "./PlayerController";
+export type {
+    JumpButtonOptions,
+    KeyAction,
+    KeyMap,
+    LegacyPlayerModelSource,
+    LegacyVehicleModelSource,
+    LoadedPlayerModelSource,
+    LoadedVehicleModelSource,
+    MobileButtonOptions,
+    MobileControlsOptions,
+    PlayerControllerOptions,
+    PlayerModelOptions,
+    PlayerModelSource,
+    VehicleInstance,
+    VehicleModelSource,
+    VehicleOptions,
+    VehicleChassisOptions,
+    VehicleSuspensionOptions,
+    VehicleSteeringOptions,
+    VehicleGripOptions,
+    VehiclePowerOptions,
+    VehicleWheelColliderUserData,
+    KinematicColliderEntry,
+} from "./types";
+export type { PlayerPlugin } from "./plugins/types";
+
+// 碰撞公开 API
+export { CollisionWorld } from "./collision/CollisionWorld";
+export type { CollisionCollider, CollisionShape, MotionType } from "./collision/CollisionWorld";
+export { CHARACTER_QUERY_MASK, ALL_COLLISION_MASK, CollisionGroup } from "./collision/groups";
+export type {
+    ColliderDesc,
+    ColliderHandle,
+    ColliderShape,
+    MeshShape,
+    BoxShape,
+    SphereShape,
+} from "./collision/colliderDesc";
+export { DYNAMIC_BODY_DEFAULTS } from "./collision/colliderDesc";
+export { DynamicSphereBody, isSphereBody } from "./collision/DynamicSphere";
+export { DynamicBoxBody, isBoxBody } from "./collision/DynamicBox";
+export { DynamicBody } from "./collision/DynamicBody";
+export type { DynamicBodyKind, DynamicBodyMaterialOptions } from "./collision/DynamicBody";
+
+// 接触 / 冲量求解
+export { ContactImpulseSolver } from "./collision/solver/ContactImpulseSolver";
+export type { ImpulseBody } from "./collision/solver/ImpulseBody";
+export { ContactManifold } from "./collision/contacts/ContactManifold";
+export { ContactPoint, CONTACT_SKIN, CONTACT_REF_EXTENT, contactSkinForExtent } from "./collision/contacts/ContactPoint";
+
+// 载具底层
+export { BVHVehicleController } from "./utils/vehiclePhysics/BVHVehicleController";
+export { VehicleRigidBody } from "./utils/vehiclePhysics/VehicleRigidBody";