feat: org privacy settings, PWA install, network map, i18n fixes, ope…

[teruselearning]

…n-source prep

Org settings:

• Restore visibility & privacy section (isOrgPublic, obscureLocation, hideName, isSpeciesPublic, showNativeStatus)
• Add breeding & loan policy section (allowBreedingRequests, breedingRequestContactId)
• Add translated location notice above map
• Add "Use My Current Location" button

Network map:

• Centre map on org's stored location on load; fall back to browser GPS only if no coords saved

i18n:

• Fix Show Native Status Badges, Hide Organisation Name, Enable Enclosures not translating in non-English languages
• Add all new keys to all 7 per-language overrides in i18n.ts and seed-languages.json

PWA:

• Add manifest.json, sw.js (network-first), and paw-print icon.svg
• Add useInstallPrompt hook and InstallPromptButton component (handles Android native prompt + iOS share-sheet hint)
• Add install button to Landing (hero) and Dashboard (compact)

Open-source prep:

• Add MIT LICENSE file
• Rewrite README: remove banner image, remove AI/Gemini references, add License section
• Rewrite installation.md: remove AI references, link to README for canonical docs
• Fix JWT_SECRET: server now exits with a clear fatal error if not set, rather than falling back to a known hardcoded string
• Update backend/package.json license field to MIT