refactor(repo): consolidate openflare-server to root and move subprojects to internal/apps

- Merge all files inside openflare-server to the repository root directory.
- Relocate agent, relay, and flared subprojects from internal/ to internal/apps/.
- Combine docker-compose files and update build context paths to root.
- Update GitHub workflows and Dockerfiles to refer to new directories and package names.
- Rewrite Go package imports across all files.
- Resolve database renew test race condition and clean up docs.

frontend/app/(main)/components/dashboard/distribution-rank-charts.tsx

@@ -0,0 +1,93 @@
+'use client';
+
+import {RankChart} from '@/components/data/rank-chart';
+import {
+  Card,
+  CardContent,
+  CardDescription,
+  CardHeader,
+  CardTitle,
+} from '@/components/ui/card';
+import type {DistributionItem, TrafficDistributions} from '@/lib/services/openflare';
+
+function toRankItems(items: DistributionItem[]) {
+  return items.map((item) => ({
+    label: item.key,
+    value: item.value,
+  }));
+}
+
+export function SourceDistributionChart({
+  items,
+}: {
+  items: TrafficDistributions['source_countries'];
+}) {
+  return (
+    <Card className="border-dashed shadow-none">
+      <CardHeader>
+        <CardTitle className="text-sm font-semibold">来源分布</CardTitle>
+        <CardDescription className="text-xs">
+          聚合最近 24 小时主要来源国家。
+        </CardDescription>
+      </CardHeader>
+      <CardContent>
+        <RankChart
+          items={toRankItems(items)}
+          color="#38bdf8"
+          emptyMessage="暂无来源分布数据"
+        />
+      </CardContent>
+    </Card>
+  );
+}
+
+export function StatusCodeDistributionChart({
+  items,
+}: {
+  items: TrafficDistributions['status_codes'];
+}) {
+  return (
+    <Card className="border-dashed shadow-none">
+      <CardHeader>
+        <CardTitle className="text-sm font-semibold">状态码分布</CardTitle>
+        <CardDescription className="text-xs">
+          快速判断成功响应是否仍是主流，以及错误码是否有抬升。
+        </CardDescription>
+      </CardHeader>
+      <CardContent>
+        <RankChart
+          items={toRankItems(items).map((item) => ({
+            ...item,
+            label: `HTTP ${item.label}`,
+          }))}
+          color="#f59e0b"
+          emptyMessage="暂无状态码分布"
+        />
+      </CardContent>
+    </Card>
+  );
+}
+
+export function TopDomainChart({
+  items,
+}: {
+  items: TrafficDistributions['top_domains'];
+}) {
+  return (
+    <Card className="border-dashed shadow-none">
+      <CardHeader>
+        <CardTitle className="text-sm font-semibold">Top Domain</CardTitle>
+        <CardDescription className="text-xs">
+          观察主要流量集中在哪些域名。
+        </CardDescription>
+      </CardHeader>
+      <CardContent>
+        <RankChart
+          items={toRankItems(items)}
+          color="#34d399"
+          emptyMessage="暂无域名分布"
+        />
+      </CardContent>
+    </Card>
+  );
+}