refactor: remove Resend email service — login required, no email needed

config: reduce max file size from 20MB to 10MB

fix: remove hardcoded admin email from config default

Merge remote-tracking branch 'origin/ntp' into phuc-dev

feat(auth+db): session-aware nav, ownership fix, admin hardening, schema cleanup

feat(ocr): refine evaluation pipeline and add results

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feat(backend): Supabase-backed storage, observability, and DB bug fixes

feat: add per-job file logging, Docling fallback provider, paper title extraction

Improve email templates and review links

Initial implementation of AI research paper review system