feat: major enhancement — OS gallery, server rename, traffic chart, backups, VNC toggle, password reset, Redis caching, UX improvements

- Remove client IP removal capability (keep backend methods removed too)
- Add copy-to-clipboard buttons for IP addresses with tooltip feedback
- Replace OS dropdown with tile gallery (grouped, searchable, brand colors, EOL badges) in rebuild panel and checkout page
- Add inline server rename with friendly name generator and RFC 1123 validation
- Add traffic statistics canvas chart with responsive resize in resources panel
- Add backup listing timeline in manage panel with show-all expansion
- Add VNC enable/disable toggle with connection details and password copy
- Add server root password reset with auto-clipboard copy (never displayed)
- Add skeleton loading placeholders, action cooldowns (power 3s, rebuild 30s), progress indicator with elapsed timer
- Sanitize all client-facing error messages (no raw API errors exposed)
- Convert all state-mutating AJAX calls from GET to POST
- Add explicit break after all output() calls in client.php
- Add Redis-backed API response caching (Cache.php): OS templates 10min, traffic/backups 2min, currencies 30min, packages 10min
- Add GitHub Actions workflow for weekly VirtFusion API change detection
- Move cache busting step after semantic-release in publish workflow
- Add endpoint doc generator script and OpenAPI baseline placeholder
- Improve hostname generation entropy (bin2hex random_bytes)
- Add .superpowers/ to .gitignore

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

docs/openapi-baseline.yaml

@@ -0,0 +1,7 @@
+# VirtFusion OpenAPI Baseline
+# This file will be auto-populated by the api-sync-check workflow
+# on first run. Do not edit manually.
+openapi: "3.0.0"
+info:
+  title: VirtFusion API Baseline Placeholder
+  version: "0.0.0"