fix(files): fix json uploads, disable storage metering when billing is disabled, exclude kb uploads from storage metering, simplify serve path route

[waleedlatif1]

Summary

• fix json uploads mime type issue by extracting mime type before checking against allowlist
• disable storage metering when billing is disabled
• exclude kb uploads from storage metering
• simplify serve path route to remove /s3 or /blob prefixes, all use /serve/ now

Type of Change

• [x] Bug fix
• [x] New feature

Testing

Tested manually.

Checklist

• [x] Code follows project style guidelines
• [x] Self-reviewed my changes
• [x] Tests added/updated and passing
• [x] No new warnings introduced
• [x] I confirm that I have read and agree to the terms outlined in the Contributor License Agreement (CLA)

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1 Skipped Deployment

Project	Deployment	Preview	Comments	Updated (UTC)
docs	Skipped			Nov 8, 2025 2:31am