fix: require S3_REGION in production + self-host all fonts (GDPR quick wins G-17, G-13)

[kristofferremback]

Problem

Two quick wins from the GDPR audit (docs/audits/gdpr-audit-2026-07.md, findings G-17 and G-13):

• G-17: apps/backend/src/lib/env.ts defaulted S3_REGION to us-east-1 while infra/aws/ provisions only eu-north-1 — a missing env var in production would silently re-home attachments and avatars to a US region. Violates INV-11 (no silent fallback defaults) with a data-residency consequence.
• G-13: two third-party font CDNs disclosed visitor IPs. The app loaded OpenDyslexic from fonts.cdnfonts.com unconditionally for every visitor (the pattern targeted by the German Google-Fonts rulings), even though the accessibility font is opt-in; the backoffice loaded Space Grotesk from fonts.googleapis.com. Every other font in the repo was already self-hosted.

Solution

S3 residency. loadConfig now throws S3_REGION is required in production, placed with the sibling production guards (CORS_ALLOWED_ORIGINS, stub-auth). The us-east-1 fallback remains for dev/test where MinIO ignores it; .env.example documents the production requirement.

Fonts. Both faces self-hosted following the existing public/fonts/ + @font-face in index.css pattern (Switzer/Commit Mono), files from Fontsource via jsDelivr full-latin (not scraped CSS — the broken-subset gotcha):

• Frontend: opendyslexic-{400,700}{,-italic}.woff2, family name "OpenDyslexic" unchanged so [data-font-family="dyslexic"] (index.css:832) and the settings preview keep working. Because the family is only applied under that attribute and the SW precache glob excludes woff2 (vite.config.ts:112 — js,css,html,ico,png,svg), browsers fetch the files only when the accessibility font is actually selected — the old CDN CSS was fetched by everyone.
• Backoffice: space-grotesk-{400,500,600,700}.woff2, preconnect/stylesheet links replaced with a preload of the 400 face.

No cdnfonts/googleapis/gstatic reference remains in either app (grep-verified).

Modified files

File	Change
apps/backend/src/lib/env.ts	Production guard: throw when S3_REGION unset (INV-11)
apps/backend/src/lib/env.test.ts	New loadConfig S3 residency describe: prod throw + dev fallback
.env.example	Note that S3_REGION is required in production
apps/frontend/index.html	Remove fonts.cdnfonts.com stylesheet link; update font comment
apps/frontend/src/index.css	Four OpenDyslexic @font-face blocks (400/700 × normal/italic)
apps/backoffice/index.html	Remove Google Fonts preconnects + stylesheet; preload 400 face
apps/backoffice/src/index.css	Four Space Grotesk @font-face blocks (400–700)

New files

File	Purpose
apps/frontend/public/fonts/opendyslexic-*.woff2 (4)	Self-hosted OpenDyslexic (~112–120 KB each, verified WOFF2)
apps/backoffice/public/fonts/space-grotesk-*.woff2 (4)	Self-hosted Space Grotesk (~13 KB each, verified WOFF2)

Out of scope (deliberate)

The other audit G-items (erasure, transparency, OpenRouter pinning, Langfuse masking) — these are the P0/P1 builds, not quick wins. Giphy's client-side CDN fetches (also G-13-adjacent) need a media proxy, not a config change.

Test plan

• bun test --env-file=/dev/null src/lib/env.test.ts — 20 pass (2 new; the clean env-file sidesteps the known stray-apps/backend/.env pollution that pre-dates this PR)
• bun run build in apps/frontend and apps/backoffice — both green; font paths in CSS match files on disk (listed side by side)
• file on all 8 downloaded woff2 — genuine WOFF2, full-size faces (not the silent-fallback subsets from the Google-Fonts-scrape gotcha)
• Pre-commit hooks: repo-wide lint + typecheck across all workspaces — clean
• Visual check of dyslexic-font rendering in a live browser — not done; family name and selector are unchanged, only the source moved

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🤖 PR by Claude Code

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📥 Commits

Reviewing files that changed from the base of the PR and between 3895bd0 and 5ff2640.

⛔ Files ignored due to path filters (9)

• .env.example is excluded by !**/.env*
• apps/backoffice/public/fonts/space-grotesk-400.woff2 is excluded by !**/*.woff2
• apps/backoffice/public/fonts/space-grotesk-500.woff2 is excluded by !**/*.woff2
• apps/backoffice/public/fonts/space-grotesk-600.woff2 is excluded by !**/*.woff2
• apps/backoffice/public/fonts/space-grotesk-700.woff2 is excluded by !**/*.woff2
• apps/frontend/public/fonts/opendyslexic-400-italic.woff2 is excluded by !**/*.woff2
• apps/frontend/public/fonts/opendyslexic-400.woff2 is excluded by !**/*.woff2
• apps/frontend/public/fonts/opendyslexic-700-italic.woff2 is excluded by !**/*.woff2
• apps/frontend/public/fonts/opendyslexic-700.woff2 is excluded by !**/*.woff2

📒 Files selected for processing (6)

• apps/backend/src/lib/env.test.ts
• apps/backend/src/lib/env.ts
• apps/backoffice/index.html
• apps/backoffice/src/index.css
• apps/frontend/index.html
• apps/frontend/src/index.css

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