fix(repair): drill explosion to natural group + apply mission rotation

- ExplodedModel.createParts now descends recursively through single
  mesh-bearing wrapper nodes (e.g. Scene > Moto > Eclatement) until
  reaching a node with multiple mesh-bearing children. Previously the
  first wrapper was used as root, so models with extra Empty/group
  parents fell back to flat leaf meshes lerping in local space.
- Add optional modelRotation field on RepairMissionConfig so fragmented
  + repairing models can match the world-space rotation of the source
  inspection model (parked Ebike).
- Ebike mission now uses EBIKE_WORLD_ROTATION_Y/EBIKE_WORLD_SCALE
  directly so the fragmented bike lines up with the parked bike.

src/data/gameplay/repairMissions.ts

@@ -3,6 +3,10 @@ import type {
   RepairMissionConfig,
   RepairMissionId,
 } from "@/types/gameplay/repairMission";
+import {
+  EBIKE_WORLD_ROTATION_Y,
+  EBIKE_WORLD_SCALE,
+} from "@/data/ebike/ebikeConfig";
 
 const REPAIR_INTERACT_UI_PATH = "/assets/world/UI/interagir.webm";
 const REPAIR_BROKEN_UI_PATH = "/assets/world/UI/cassé.webm";
@@ -20,7 +24,8 @@ export const REPAIR_MISSIONS: Record<RepairMissionId, RepairMissionConfig> = {
     description:
       "Repair the damaged cooling module before relaunching the bike",
     modelPath: "/models/ebike/model.gltf",
-    modelScale: 0.3,
+    modelScale: EBIKE_WORLD_SCALE,
+    modelRotation: [0, EBIKE_WORLD_ROTATION_Y, 0],
     stageUiPath: "/assets/world/UI/ebike-mission-notification.webm",
     interactUiPath: REPAIR_INTERACT_UI_PATH,
     brokenUiPath: REPAIR_BROKEN_UI_PATH,