feat: remove confirmUpload, upload_requests, and files.status — simplify storage

[pyramation]

Summary

Companion to constructive-db #983. Strips storage upload complexity from the GraphQL plugin layer:

• Remove confirmUpload mutation — files are ready immediately after presigned URL PUT
• Remove upload_requests from storage-module-cache — no more uploadRequestsQualifiedName queries
• Remove files.status from all paths — downloadUrl no longer gates on status, requestUploadUrl payload drops status
• Simplify dedup — returns existing file ID with deduplicated: true, no DB tracking fields
• Remove ConfirmUploadInput/ConfirmUploadPayload types
• Update DataImageEmbedding — remove status_field/status_ready_value/status_pending_value params
• Update snapshots, tests, seeds — graphile-test, server-test, upload.integration.test all updated
• Update README + package.json descriptions

Review & Testing Checklist for Human

• Verify plugin.ts no longer registers confirmUpload mutation — only requestUploadUrl and provisionBucket remain
• Verify download-url-field.ts serves download URLs without any status check — if file row exists and has a key, it works
• Verify storage-module-cache.ts query no longer joins/selects upload_requests columns
• Verify types.ts RequestUploadUrlPayload has no status field
• Test the full upload flow locally after merging both PRs: requestUploadUrl → PUT to MinIO → downloadUrl works immediately (no confirm step)
• Verify dedup: requesting the same content hash returns deduplicated: true with uploadUrl: null

Notes

All 49 CI checks pass.

Merge order: constructive-db #983 first → this PR second. The DB schema removes upload_requests table and files.status column; this PR removes the GraphQL plugin code that used them.

Link to Devin session: https://app.devin.ai/sessions/ffa3ed8652fc412f976accbdc229c88d
Requested by: @pyramation

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