Implement Phase 8: Dashboard & Reports (v0.8.0)

- Add comprehensive admin dashboard with stat cards and widgets
- Add Chart.js for occupancy/revenue trend charts
- Add Reports page with Occupancy, Revenue, Guest tabs
- Add CSV and PDF export functionality (using mPDF)
- Add date range filters for reports

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

composer.json

@@ -22,7 +22,8 @@
     "require": {
         "php": ">=8.3.0",
         "twig/twig": "^3.0",
-        "magdev/wc-licensed-product-client": "^0.2"
+        "magdev/wc-licensed-product-client": "^0.2",
+        "mpdf/mpdf": "^8.2"
     },
     "autoload": {
         "psr-4": {