feat(grafana): add ActivityWatch Prometheus exporter and dashboards

- Add Python exporter for ActivityWatch API metrics collection
- Configure Prometheus to scrape ActivityWatch exporter
- Create Grafana dashboard for ActivityWatch overview
- Integrate ActivityWatch monitoring into existing docker-compose stack
- Add Prometheus datasource for ActivityWatch metrics

Generated with [Devin](https://cli.devin.ai/docs)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

grafana-1c/grafana/provisioning/dashboards/dashboards.yml

@@ -9,3 +9,12 @@ providers:
     editable: false
     options:
       path: /var/lib/grafana/dashboards
+
+  - name: ActivityWatch
+    orgId: 2
+    folder: "ActivityWatch"
+    type: file
+    disableDeletion: false
+    editable: true
+    options:
+      path: /var/lib/grafana/dashboards

grafana-1c/grafana/provisioning/datasources/aw_prometheus.yml

@@ -0,0 +1,9 @@
+apiVersion: 1
+
+datasources:
+  - name: Prometheus
+    type: prometheus
+    access: proxy
+    url: http://prometheus:9090
+    isDefault: true
+    editable: true

grafana-1c/grafana/provisioning/datasources/datasources.yml

@@ -0,0 +1,9 @@
+apiVersion: 1
+
+datasources:
+  - name: Prometheus
+    type: prometheus
+    access: proxy
+    url: http://prometheus:9090
+    isDefault: true
+    editable: true