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/modify.sql

@@ -0,0 +1,49 @@
+-- Insert records for Initial Operating System if they don't already exist
+INSERT INTO tblcustomfields
+(type, relid, fieldname, fieldtype, description, fieldoptions, regexpr, adminonly, required, showorder, showinvoice,
+ sortorder, created_at, updated_at)
+SELECT 'product',
+       id,
+       'Initial Operating System',
+       'text',
+       '',
+       '',
+       '',
+       '',
+       '',
+       'on',
+       '',
+       0,
+       UTC_TIMESTAMP(),
+       UTC_TIMESTAMP()
+FROM tblproducts
+WHERE servertype = 'VirtFusionDirect'
+  AND NOT EXISTS (SELECT 1
+                  FROM tblcustomfields
+                  WHERE fieldname = 'Initial Operating System'
+                    AND relid = tblproducts.id);
+
+-- Insert records for Initial SSH Key if they don't already exist
+INSERT INTO tblcustomfields
+(type, relid, fieldname, fieldtype, description, fieldoptions, regexpr, adminonly, required, showorder, showinvoice,
+ sortorder, created_at, updated_at)
+SELECT 'product',
+       id,
+       'Initial SSH Key',
+       'text',
+       '',
+       '',
+       '',
+       '',
+       '',
+       'on',
+       '',
+       0,
+       UTC_TIMESTAMP(),
+       UTC_TIMESTAMP()
+FROM tblproducts
+WHERE servertype = 'VirtFusionDirect'
+  AND NOT EXISTS (SELECT 1
+                  FROM tblcustomfields
+                  WHERE fieldname = 'Initial SSH Key'
+                    AND relid = tblproducts.id);