feat: initial Blocky widget for Homepage dashboard

Parses Blocky's /metrics (Prometheus text) endpoint to show:
- Blocking status (Enabled/Disabled)
- Blocked domains count (denylist entries)
- Total queries served
- Cache hit rate %

No REST stats endpoint exists in Blocky, so the proxy handler
fetches and parses the Prometheus text format directly.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

translations/en.json

@@ -0,0 +1,10 @@
+{
+  "blocky": {
+    "status": "Status",
+    "enabled": "Enabled",
+    "disabled": "Disabled",
+    "domains": "Blocked Domains",
+    "queries": "Total Queries",
+    "cacheHitRate": "Cache Hit Rate"
+  }
+}