生成目录化的Tripo API与画布TS绑定

- 生成模型输入、结果落点、产物元数据与按端点的结果类型到 packages/shared/src/contracts/model3d 子目录
- 新增 editor-canvas 生成目录，画布占位载荷不再依赖手写 TS
- 更新 model3d 导出索引，移除已删除的占位作业类型
- contracts:model3d:generate 生成后自动跑 prettier

package.json

@@ -42,7 +42,7 @@
     "admin-web:typecheck": "node scripts/admin-web-build.mjs typecheck",
     "admin-web:preview": "npm --prefix apps/admin-web run preview --",
     "spacetime:generate": "node scripts/generate-spacetime-bindings.mjs",
-    "contracts:model3d:generate": "cargo test --locked -p shared-contracts model3d --manifest-path server-rs/Cargo.toml",
+    "contracts:model3d:generate": "cargo test --locked -p shared-contracts --manifest-path server-rs/Cargo.toml -- model3d editorcanvas && prettier --write packages/shared/src/contracts/model3d packages/shared/src/contracts/editor-canvas",
     "spacetime:external-generation:maintain": "node scripts/spacetime-maintain-external-generation-jobs.mjs",
     "spacetime:editor-image-asset-kind:clean": "node scripts/spacetime-clean-editor-image-asset-kind.mjs",
     "spacetime:editor-canvas-layout:migrate": "node scripts/spacetime-migrate-editor-canvas-layout.mjs",