chore: migrate Docker registry + GitHub URLs to PicPeak org

Repo transferred from the-luap/picpeak → PicPeak/picpeak. Docker images
publish to ghcr.io/picpeak/picpeak/{backend,frontend} (lowercase, per the
GHCR canonical form computed by docker-build.yml's `${GITHUB_REPOSITORY,,}`).

Sweep covers:
- docker-compose.production.yml + Dockerfiles → new image registry path
- README, CONTRIBUTING, SECURITY, SIMPLE_SETUP, scripts/picpeak-setup.sh
  → new GitHub URLs
- Update-check / release-notes services (updateCheckService,
  environmentService, updateNotificationService, adminSystem,
  UpdateNotification, githubReleaseUrl) → GitHub API + tag URLs use the
  canonical PicPeak/picpeak path
- Issue templates + README-DOCKER + workflow README → updated package URLs
- One commit-context comment in migrations/090 + customerAccountsService

CHANGELOG.md is intentionally untouched (historical release entries are
immutable; GitHub auto-redirects the old URLs indefinitely).
CLAUDE.md keeps the bare `(the-luap)` reference — that's the maintainer's
personal handle, not a repo URL.

22 files, 48/48 line swaps (every change is a 1:1 URL replacement).

scripts/picpeak-setup.sh

@@ -13,7 +13,7 @@ IFS=$'\n\t'
 # Script configuration
 readonly SCRIPT_VERSION="2.1.0"
 readonly APP_NAME="PicPeak"
-readonly REPO_URL="https://github.com/the-luap/picpeak.git"
+readonly REPO_URL="https://github.com/PicPeak/picpeak.git"
 readonly NODE_VERSION="20"
 readonly MIN_RAM_DOCKER=2048
 readonly MIN_RAM_NATIVE=1024
@@ -1157,8 +1157,8 @@ print_success_message() {
     echo
     echo "📚 Documentation:"
     echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
-    echo "Setup Guide:  https://github.com/the-luap/picpeak/blob/main/SIMPLE_SETUP.md"
-    echo "Full Docs:    https://github.com/the-luap/picpeak"
+    echo "Setup Guide:  https://github.com/PicPeak/picpeak/blob/main/SIMPLE_SETUP.md"
+    echo "Full Docs:    https://github.com/PicPeak/picpeak"
     echo
     echo -e "${GREEN}✨ Setup complete! Visit the admin panel to start creating galleries.${NC}"
 }