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>

packages/shared-storage/README.md

@@ -1,6 +1,6 @@
 # @manacore/shared-storage
 
-S3-compatible object storage client for the Manacore monorepo. Uses MinIO for local development and Hetzner Object Storage in production.
+S3-compatible object storage client for the Manacore monorepo. Uses MinIO for S3-compatible storage.
 
 ## Setup
 
@@ -208,7 +208,7 @@ This creates the following Prometheus metrics:
 
 ```env
 # Required
-S3_ENDPOINT=http://localhost:9000      # MinIO local / Hetzner production
+S3_ENDPOINT=http://localhost:9000      # MinIO
 S3_REGION=us-east-1
 S3_ACCESS_KEY=minioadmin
 S3_SECRET_KEY=minioadmin