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>

src/widgets/blocky/proxy.js

@@ -0,0 +1,38 @@
+import { httpProxy } from "utils/proxy/http";
+import getServiceWidget from "utils/service-helpers";
+import { formatApiCall } from "utils/proxy/api-helpers";
+import createLogger from "utils/logger";
+
+const logger = createLogger("blocky");
+
+function parseMetric(text, name) {
+  // Matches bare metric or metric with labels:  my_metric{label="x"} 1.0
+  const re = new RegExp(`^${name}(?:{[^}]*})?\\s+([0-9.e+\\-]+)`, "m");
+  const m = text.match(re);
+  return m ? parseFloat(m[1]) : 0;
+}
+
+export default async function blockyProxyHandler(req, res) {
+  const { group, service } = req.query;
+  const widget = await getServiceWidget(group, service);
+  const url = formatApiCall("{url}/metrics", widget);
+
+  const [status, , data] = await httpProxy(url);
+
+  if (status !== 200) {
+    logger.error("HTTP %d fetching Blocky metrics from %s", status, url);
+    return res.status(status).json({ error: `HTTP ${status}` });
+  }
+
+  const text = data.toString();
+  const hits = parseMetric(text, "blocky_cache_hits_total");
+  const misses = parseMetric(text, "blocky_cache_misses_total");
+  const total = hits + misses;
+
+  return res.json({
+    enabled: parseMetric(text, "blocky_blocking_enabled") === 1,
+    denylistEntries: parseMetric(text, "blocky_denylist_cache_entries"),
+    totalQueries: total,
+    cacheHitRate: total > 0 ? (hits / total) * 100 : 0,
+  });
+}