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>

README.md

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+# homepage-blocky-widget
+
+A [Blocky](https://0xerr0r.github.io/blocky/) service widget for the
+[Homepage](https://gethomepage.dev) dashboard.
+
+Blocky is a DNS ad-blocker and resolver. This widget shows live stats pulled
+from Blocky's Prometheus `/metrics` endpoint.
+
+## Preview
+
+```
+┌─────────────────────────────────────────┐
+│  Pi DNS                                 │
+│  DNS ad-blocker                         │
+│                                         │
+│  Status          Enabled                │
+│  Blocked Domains 84,242                 │
+│  Total Queries   333                    │
+│  Cache Hit Rate  10.5%                  │
+└─────────────────────────────────────────┘
+```
+
+## Requirements
+
+- Blocky with `ports.http` configured (default: 4000)
+- Prometheus metrics enabled in Blocky config:
+  ```yaml
+  prometheus:
+    enable: true
+    path: /metrics
+  ```
+
+## Installation
+
+See [INSTALL.md](INSTALL.md).
+
+## Why a custom widget?
+
+Blocky has no REST endpoint for query statistics — only `/api/blocking/status`
+(toggle state) and `/metrics` (Prometheus text format). This widget includes a
+small proxy handler that fetches and parses the metrics endpoint, returning the
+relevant values as JSON to the React component.
+
+There is an open feature request at the official Homepage repo:
+https://github.com/gethomepage/homepage/discussions/2732
+
+Once it reaches the required 20 upvotes, this widget can be submitted upstream.