chore: rename cameleer3 to cameleer

Rename Java packages from net.siegeln.cameleer3 to net.siegeln.cameleer,
update all references in workflows, Docker configs, docs, and bootstrap.

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

ui/sign-in/src/SignInPage.tsx

@@ -1,7 +1,7 @@
 import { type FormEvent, useMemo, useState } from 'react';
 import { Eye, EyeOff } from 'lucide-react';
 import { Card, Input, Button, Alert, FormField } from '@cameleer/design-system';
-import cameleerLogo from '@cameleer/design-system/assets/cameleer3-logo.svg';
+import cameleerLogo from '@cameleer/design-system/assets/cameleer-logo.svg';
 import { signIn } from './experience-api';
 import styles from './SignInPage.module.css';