fix(xiaoyunque): support reference video assets

[superche]

Summary

• register legacy upload_file reference-video results through AssetCreateV2 when pippit_asset_id is missing or blank
• preserve the direct-ID path and existing image behavior while mapping the upload and registration asset enums correctly for video
• add video-specific safe diagnostics and end-to-end fake-API coverage
• release xiaoyunque-generation 0.3.5 with companion 0.3.3 and Registry sequence 24

Follow-up to #19.

Root cause

upload_file uses asset type 1 for video and may return only an EverPhoto asset_id. The generation payload also needs the registered Pippit identity. #19 registered upload type 2 (images), so reference video could reach submission without pippit_asset_id.

Impact

Reference videos uploaded from Convax are now registered before generation submission. Existing uploads that already return pippit_asset_id remain unchanged. Registration failures stop before submission and expose only stable safe diagnostics.

Validation

• bun install --frozen-lockfile --ignore-scripts
• focused XiaoYunque typecheck and 53 tests
• bun run check (workspace builds/typechecks/tests, companion builds/smokes, tooling tests, validation, packing, and Registry/Showcase index generation)
• 33 FFmpeg workspace tests, 112 XiaoYunque workspace tests, and 52 tooling tests passed

No live or billable XiaoYunque generation was triggered.