Fix placeholder URLs and references for OSS release

- Update php-security-lint wrapper script with correct repository URL
- Remove non-existent schema reference from config example
- Replace GitHub placeholder URLs with Gitea URLs

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.security-lint.json.example

@@ -1,5 +1,4 @@
 {
-    "$schema": "https://raw.githubusercontent.com/security-linter/php-laravel/main/schema/config.json",
     "$comment": "Example configuration file for PHP/Laravel Security Linter",
 
     "severity": "low",