Fix: clean mesh FBX를 pre-rig 모델 기준으로 수정

[yyuneu]

Summary

• Tripo API가 FBX를 반환할 때 .glb로 저장하던 버그 수정 (Unity "invalid magic" 크래시 원인)
• clean mesh FBX 생성 시점을 rig 완료 후 → model 완료 후(pre-rig)로 수정 (뼈대 없는 상태에서 변환)
• image_to_model 태스크에 out_format: "glb" 명시 추가

Tasks

• FileValidator — validateGlb(byte[]) 오버로드 추가
• TripoApiService — image_to_model에 out_format: "glb" 추가
• MascotGenerationService — Phase 1/2 다운로드 후 GLB 매직바이트 검증 (FBX면 Phase 2 rig 실패 처리, Phase 1 변환 skip)
• stripRig.js — gltf-transform 제거, assimp 변환만 남김
• clean mesh 생성 시점: rig 완료 → model 완료(pre-rig)로 변경

To Reviewer

• 운영 DB 즉각 조치 완료: site 1 model_url 유효 GLB로 복구
• Tripo FBX 반환은 재현 조건 불명확 — out_format: "glb" 명시 + magic byte 검증으로 방어

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 4f766aed-9eb5-4243-b39b-7a530a558585

📥 Commits

Reviewing files that changed from the base of the PR and between a9e865a and 54bbf32.

📒 Files selected for processing (4)

• guideon-admin-bff/src/main/java/com/guideon/guideonbackend/domain/mascot/service/MascotGenerationService.java
• guideon-admin-bff/src/main/java/com/guideon/guideonbackend/domain/mascot/service/TripoApiService.java
• guideon-admin-bff/src/main/java/com/guideon/guideonbackend/global/storage/FileValidator.java
• mesh-processor/src/stripRig.js

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/clean-mesh-pre-rig

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