remove footer from the branding

[antosubash]

fotter is managed from the sitelayout so we done need that in the branding

[antosubash]

🤖 Claimed. I am creating an isolated worktree from origin/main and starting implementation.

[antosubash]

✅ Draft pull request opened: #275

Summary

• Removed configurable footer ownership from the branding module, including API routes, settings, contracts, shared props, editor components, and localization keys.
• Restored framework-owned footer rendering in site layouts.
• Updated branding documentation and added regression coverage confirming footer routes return 404.

Changed areas

• modules/branding/
• packages/ui/
• Generated packages/i18n/src/*
• Branding documentation

Verification

• uv run --all-packages pytest modules/branding/tests — 114 passed
• npx vitest run packages/ui/src/components/BrandingFooter.test.tsx — 3 passed
• make lint — passed
• uv run --all-packages python -m simple_module_core — 0 errors, one unrelated existing SM003 AuditLog warning
• git diff --check — passed

Evidence / risks

• Visual evidence: none.
• Existing persisted footer setting rows are left inert rather than destructively deleted.
• No blockers.