chore: full project audit cleanup, dead code removal, and documentation update

Dead code removed:
- Module.php: remove assignBackupPlan(), getSelfServiceCurrencies() (no callers)
- Cache.php: remove forgetPattern() (no callers, no-op on filesystem)
- module.js: remove vfLoadSelfServiceReport() (no UI trigger)

Stale files removed:
- .releaserc.json (orphaned, conflicts with tag-based workflow)
- .github/workflows/api-sync-check.yml (baseline never populated)
- docs/openapi-baseline.yaml (placeholder stub)
- scripts/generate-endpoint-doc.sh (broken grep patterns)

Security fixes:
- AdminHTML: cast $serverId to (int), cast $serviceId to (int)
- admin.php: add explicit break after every output() call, sanitize error msgs

File hygiene:
- Move modify.sql into modules/servers/VirtFusionDirect/ (matches README docs)
- Fix CHANGELOG.md: remove duplicate 1.0.0 entry, clean up mixed git host URLs

Documentation:
- CLAUDE.md: full rewrite with current architecture, Cache class, development
  rules (try/catch, ownership validation, HTTP methods, caching policy)
- README.md: remove stale IPv4 removal references, add new features (traffic,
  backups, VNC toggle, password reset, OS gallery, copy buttons), add Cache.php
  to file structure, remove "Primary IPv4 Protection" known issue

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

modules/servers/VirtFusionDirect/lib/AdminHTML.php

@@ -25,6 +25,7 @@ EOT;
 
     public static function serverId($serverId)
     {
+        $serverId = (int) $serverId;
         return <<<EOT
             <input type="text" class="form-control input-200 input-inline" name="modulefields[0]" size="20" value="${serverId}" />
             <span class="text-info">&nbsp;&nbsp;Changing the Sever ID manually is not recommended. Alterations to this field are usually handled automatically.</span>
@@ -34,6 +35,7 @@ EOT;
     public static function serverInfo($systemUrl, $serviceId)
     {
         $systemUrl = htmlspecialchars($systemUrl, ENT_QUOTES, 'UTF-8');
+        $serviceId = (int) $serviceId;
         $cacheV = time();
         return <<<EOT
             <link href="${systemUrl}modules/servers/VirtFusionDirect/templates/css/module.css?v=${cacheV}" rel="stylesheet">