docs(cloud): sync POST /api/assets OpenAPI with current cloud behavior

[comfyui-wiki]

Summary

• Remove deprecated application/json URL upload from POST /api/assets in openapi-cloud.yaml
• Document multipart-only asset creation and point URL flows to POST /api/assets/download and GET /api/assets/remote-metadata
• Align request/response fields with cloud/services/ingest/openapi.yaml (tags as JSON string, hash field, dedup 200/201 semantics)
• Clarify remote-metadata 400 errors and add civitai.red to allowed download domains

Fixes misleading public docs that led to UNSUPPORTED_SOURCE confusion (#754). Related to #1308 / #806 guide work.

Test plan

• openapi-cloud.yaml parses as valid YAML
• Cloud/API reviewer confirms POST /api/assets multipart-only behavior
• Mintlify Cloud API Reference renders updated POST /api/assets page
• Verify no regression on existing asset/download endpoint docs

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

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Run ID: 00c68a77-d816-48d8-a363-036f3d422778

📥 Commits

Reviewing files that changed from the base of the PR and between d01fffb and 9fa9c62.

📒 Files selected for processing (1)

• openapi-cloud.yaml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/sync-openapi-cloud-assets

✨ Simplify code

• Create PR with simplified code
• Commit simplified code in branch docs/sync-openapi-cloud-assets

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