chore: remove remaining Hetzner references across codebase

Deleted:
- DOCKER_REGISTRY_SETUP.md, QUICK_START_CICD.md (legacy CI/CD docs)
- docs/ULOAD-DEPLOYMENT.md (Hetzner VPS deployment guide)
- scripts/get-ssh-key.sh, scripts/remove-coolify-references.sh (legacy scripts)

Updated Hetzner → MinIO references in:
- shared-storage (package.json, README, client.ts, types.ts)
- App CLAUDE.md files (mukke, storage, planta, picture)
- .claude/GUIDELINES.md, sveltekit-web.md guideline
- TROUBLESHOOTING.md, SETUP_TEMPLATES.md (replaced IPs with placeholders)
- GIT_WORKFLOW.md, COMMANDS.md
- services/matrix-project-doc-bot/CLAUDE.md

Remaining Hetzner mentions are in historical devlogs/audits and docs
that list Hetzner as a hosting alternative (not as active infrastructure).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.claude/GUIDELINES.md

@@ -49,7 +49,7 @@ This directory contains comprehensive guidelines for working in the Mana Univers
 | **Mobile** | Expo SDK 52-54 | React Native, NativeWind |
 | **Database** | PostgreSQL | Via Drizzle ORM |
 | **Auth** | Mana Core Auth | Better Auth, EdDSA JWT |
-| **Storage** | S3-compatible | MinIO (dev), Hetzner (prod) |
+| **Storage** | S3-compatible | MinIO |
 
 ## Project Structure