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>

apps/planta/CLAUDE.md

@@ -47,7 +47,7 @@ pnpm preview                     # Preview production build
 - **Web**: SvelteKit 2.x, Svelte 5 (runes mode), Tailwind CSS
 - **Backend**: NestJS 10, Drizzle ORM, PostgreSQL
 - **AI**: Google Gemini Vision for plant analysis
-- **Storage**: MinIO (local) / Hetzner S3 (prod)
+- **Storage**: MinIO (S3-compatible)
 - **Auth**: Mana Core Auth (JWT)
 - **Types**: TypeScript 5.x
 
@@ -163,5 +163,5 @@ PUBLIC_MANA_CORE_AUTH_URL=http://localhost:3001
 1. **Authentication**: Uses Mana Core Auth (JWT in Authorization header)
 2. **Database**: PostgreSQL with Drizzle ORM
 3. **Port**: Backend runs on port 3022 by default
-4. **Storage**: Photos stored in MinIO (local) / Hetzner S3 (prod)
+4. **Storage**: Photos stored in MinIO (S3-compatible)
 5. **AI**: Google Gemini Vision for plant identification