feat: 注册 Prometheus 指标与 Handler

go.sum

@@ -1,17 +1,47 @@
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@@ -24,6 +54,10 @@ golang.org/x/sys v0.48.0 h1:bbX/i/6MgT9BVLM9RT1thmxL04yeTAhbEz4SyadbXoo=
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