Implement dual-license system (AGPL v3 + Commercial)

- Add AGPL v3 license with commercial addendum (LICENSE)
- Add comprehensive license documentation (LICENSE-INFO.md)
- Add contribution guidelines with notification requirements (CONTRIBUTING.md)
- Update version.php with dual-license information

Dual-license model:
- AGPL v3 for open-source use (free, must share modifications)
- Commercial license for proprietary use (paid, €99-€2499)
- Donation tiers for supporters (€25-€1000+)

Requirements for users:
- Must notify author of modifications (via GitLab/email)
- Must create CHANGES.md documenting modifications
- Must share source code (AGPL v3) OR purchase commercial license
- Must maintain attribution to original author

Commercial licensing:
- Individual: €99 (1 developer)
- Business: €499 (10 developers)
- Enterprise: €2499 (unlimited)
- SaaS: €999/year

Contact: commercial@noorlander.info

This licensing structure protects intellectual property while supporting
the open-source community and enabling commercial revenue.

version.php

@@ -38,8 +38,10 @@ return [
     ],
     
     'credits' => [
-        'author' => 'CodePress Development Team',
-        'license' => 'MIT',
-        'repository' => 'https://git.noorlander.info/E.Noorlander/CodePress.git'
+        'author' => 'E.Noorlander / CodePress Development Team',
+        'license' => 'AGPL v3 / Commercial',
+        'license_info' => 'Dual-licensed: AGPL v3 for open-source, Commercial license for proprietary use',
+        'repository' => 'https://git.noorlander.info/E.Noorlander/CodePress.git',
+        'contact' => 'commercial@noorlander.info'
     ]
 ];