Add Grafana dashboard and wp-prometheus integration (v0.7.5)

- Add example Grafana dashboard with 24 panels for license metrics
- Register dashboard with wp-prometheus via hook
- Add dashboard documentation with PromQL examples and alerting rules
- Update README with monitoring section

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

CLAUDE.md

@@ -2031,3 +2031,39 @@ Added Prometheus metrics integration to expose license and API metrics for monit
 - Static methods allow increment from API controllers without dependency injection
 - Counter values persist across requests via `wclp_prometheus_counters` option
 - Gauges query database on each metric collection (uses existing statistics methods)
+
+### 2026-02-03 - Grafana Dashboard & WP Prometheus Integration
+
+**Overview:**
+
+Added example Grafana dashboard JSON and integrated with wp-prometheus dashboard registration system.
+
+**New files:**
+
+- `docs/grafana-dashboard.json` - Complete Grafana dashboard with 24 panels
+- `docs/grafana-dashboard.md` - Installation and usage documentation
+
+**Dashboard panels:**
+
+- License Overview: Total, Active, Lifetime, Expiring Soon, Expired, Revoked stats + pie chart + time series
+- Downloads & Versions: Total downloads, active versions, download trends
+- API Metrics: Request rates by endpoint/result, pie chart breakdown, top requests table
+- Errors & Rate Limiting: Rate limit events, validation errors by type over time
+
+**WP Prometheus integration:**
+
+- Dashboard automatically registered via `wp_prometheus_register_dashboards` hook
+- Appears in Settings > WP Prometheus > Dashboards tab when metrics are enabled
+- Uses file-based registration with metadata (title, description, icon, plugin attribution)
+
+**Modified files:**
+
+- `src/Metrics/PrometheusController.php` - Added `registerDashboard()` method and hook registration
+- `docs/grafana-dashboard.md` - Added wp-prometheus installation option as recommended method
+- `README.md` - Added "Monitoring with Prometheus & Grafana" section linking to dashboard docs
+
+**Technical notes:**
+
+- Dashboard registration only occurs when metrics are enabled (same condition as metric collection)
+- Uses `dashicons-admin-network` icon for dashboard list
+- File path uses `WC_LICENSED_PRODUCT_PLUGIN_DIR` constant for reliable path resolution