feat: add GitHub repository dashboard with Prometheus metrics

ghtracker authenticates as a GitHub App and scans a configured list of repositories on a schedule. It serves a dashboard, a JSON state endpoint, a health probe and Prometheus metrics.

The dashboard lists only items that need attention: failing workflows, pull requests that wait too long or fail their checks, stale issues and projects that failed to scan. It has search, dynamic filters and a button that rescans on demand. The Vue app is embedded in the Go binary.

The client protects the GitHub rate limit with conditional requests, a request reserve and Retry-After handling.

src/components/ui/badge/Badge.vue

@@ -0,0 +1,28 @@
+<script setup lang="ts">
+import type { PrimitiveProps } from 'reka-ui'
+import type { HTMLAttributes } from 'vue'
+import type { BadgeVariants } from '.'
+import { reactiveOmit } from '@vueuse/core'
+import { Primitive } from 'reka-ui'
+import { cn } from '@/lib/utils'
+import { badgeVariants } from '.'
+
+const props = defineProps<
+  PrimitiveProps & {
+    variant?: BadgeVariants['variant']
+    class?: HTMLAttributes['class']
+  }
+>()
+
+const delegatedProps = reactiveOmit(props, 'class')
+</script>
+
+<template>
+  <Primitive
+    data-slot="badge"
+    :class="cn(badgeVariants({ variant }), props.class)"
+    v-bind="delegatedProps"
+  >
+    <slot />
+  </Primitive>
+</template>

src/components/ui/badge/index.ts

@@ -0,0 +1,24 @@
+import type { VariantProps } from 'class-variance-authority'
+import { cva } from 'class-variance-authority'
+
+export { default as Badge } from './Badge.vue'
+
+export const badgeVariants = cva(
+  'inline-flex items-center justify-center rounded-full border px-2 py-0.5 text-xs font-medium w-fit whitespace-nowrap shrink-0 [&>svg]:size-3 gap-1 [&>svg]:pointer-events-none focus-visible:border-ring focus-visible:ring-ring/50 focus-visible:ring-3 aria-invalid:ring-destructive/20 dark:aria-invalid:ring-destructive/40 aria-invalid:border-destructive transition-[color,box-shadow] overflow-hidden',
+  {
+    variants: {
+      variant: {
+        default: 'border-transparent bg-primary text-primary-foreground [a&]:hover:bg-primary/90',
+        secondary:
+          'border-transparent bg-secondary text-secondary-foreground [a&]:hover:bg-secondary/90',
+        destructive:
+          'border-transparent bg-destructive text-white [a&]:hover:bg-destructive/90 focus-visible:ring-destructive/20 dark:focus-visible:ring-destructive/40 dark:bg-destructive/60',
+        outline: 'text-foreground [a&]:hover:bg-accent [a&]:hover:text-accent-foreground',
+      },
+    },
+    defaultVariants: {
+      variant: 'default',
+    },
+  },
+)
+export type BadgeVariants = VariantProps<typeof badgeVariants>