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).

frontend/src/utils/__tests__/githubReleaseUrl.test.ts

@@ -12,13 +12,13 @@ import { githubReleaseUrl } from '../githubReleaseUrl';
 describe('githubReleaseUrl', () => {
   it('maps a stable version to its tag page', () => {
     expect(githubReleaseUrl('3.55.0')).toBe(
-      'https://github.com/the-luap/picpeak/releases/tag/v3.55.0',
+      'https://github.com/PicPeak/picpeak/releases/tag/v3.55.0',
     );
   });
 
   it('maps a beta version (with channel suffix) to its tag page', () => {
     expect(githubReleaseUrl('3.55.0-beta.0')).toBe(
-      'https://github.com/the-luap/picpeak/releases/tag/v3.55.0-beta.0',
+      'https://github.com/PicPeak/picpeak/releases/tag/v3.55.0-beta.0',
     );
   });
 

frontend/src/utils/githubReleaseUrl.ts

@@ -11,4 +11,4 @@
  * indicator to link to the upgrade target's notes.
  */
 export const githubReleaseUrl = (version: string): string =>
-  `https://github.com/the-luap/picpeak/releases/tag/v${version}`;
+  `https://github.com/PicPeak/picpeak/releases/tag/v${version}`;