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)/nodes/components/agent-update-dialog.tsx

@@ -0,0 +1,170 @@
+'use client';
+
+import {useState} from 'react';
+import {useQuery} from '@tanstack/react-query';
+import {ExternalLink, Loader2} from 'lucide-react';
+
+import {Button} from '@/components/ui/button';
+import {
+  Dialog,
+  DialogContent,
+  DialogDescription,
+  DialogFooter,
+  DialogHeader,
+  DialogTitle,
+} from '@/components/ui/dialog';
+import {formatDateTime} from '@/lib/utils';
+import type {NodeAgentReleaseInfo, NodeItem, ReleaseChannel} from '@/lib/services/openflare';
+import {NodeService} from '@/lib/services/openflare';
+
+import {NodeStatusBadge} from './node-status-badge';
+import {formatRelativeTime, getErrorMessage} from './node-utils';
+
+export function AgentUpdateDialog({
+  open,
+  node,
+  submitting,
+  onClose,
+  onConfirm,
+}: {
+  open: boolean;
+  node: NodeItem;
+  submitting: boolean;
+  onClose: () => void;
+  onConfirm: (release: NodeAgentReleaseInfo | null, channel: ReleaseChannel) => Promise<void>;
+}) {
+  const [channel, setChannel] = useState<ReleaseChannel>('stable');
+
+  const releaseQuery = useQuery({
+    queryKey: ['openflare', 'node-agent-release', node.id, channel],
+    queryFn: () => NodeService.getAgentRelease(node.id, channel),
+    enabled: open,
+  });
+
+  const release = releaseQuery.data ?? null;
+
+  return (
+    <Dialog open={open} onOpenChange={(next) => !next && onClose()}>
+      <DialogContent className="sm:max-w-xl">
+        <DialogHeader>
+          <DialogTitle>Agent 升级</DialogTitle>
+          <DialogDescription>
+            检查 GitHub 发布并向节点下发升级指令，节点将在下一次心跳后执行。
+          </DialogDescription>
+        </DialogHeader>
+
+        <div className="space-y-4">
+          <div className="grid gap-3 sm:grid-cols-3">
+            <div className="rounded-lg border p-3">
+              <p className="text-xs text-muted-foreground">当前版本</p>
+              <p className="mt-1 text-sm font-medium">{node.version || 'unknown'}</p>
+            </div>
+            <div className="rounded-lg border p-3">
+              <p className="text-xs text-muted-foreground">检查通道</p>
+              <p className="mt-1 text-sm font-medium">
+                {channel === 'preview' ? '预览版' : '正式版'}
+              </p>
+            </div>
+            <div className="rounded-lg border p-3">
+              <p className="text-xs text-muted-foreground">更新状态</p>
+              <div className="mt-1">
+                <NodeStatusBadge
+                  label={
+                    node.update_requested
+                      ? node.update_channel === 'preview'
+                        ? '等待预览更新'
+                        : '等待更新'
+                      : '未下发'
+                  }
+                  tone={node.update_requested ? 'warning' : 'info'}
+                />
+              </div>
+            </div>
+          </div>
+
+          {releaseQuery.isFetching ? (
+            <div className="flex items-center justify-center py-8 text-sm text-muted-foreground">
+              <Loader2 className="size-4 mr-2 animate-spin" />
+              检查发布版本中...
+            </div>
+          ) : releaseQuery.isError ? (
+            <p className="text-sm text-destructive">{getErrorMessage(releaseQuery.error)}</p>
+          ) : release ? (
+            <div className="space-y-3 rounded-lg border p-4">
+              <div className="flex flex-wrap items-center gap-2">
+                <NodeStatusBadge
+                  label={release.has_update ? '发现可升级版本' : '当前已是最新版本'}
+                  tone={release.has_update ? 'warning' : 'success'}
+                />
+                {release.prerelease ? (
+                  <NodeStatusBadge label="Preview 发布" tone="warning" />
+                ) : (
+                  <NodeStatusBadge label="正式发布" tone="info" />
+                )}
+              </div>
+              <div className="grid gap-3 sm:grid-cols-2 text-sm">
+                <div>
+                  <p className="text-xs text-muted-foreground">目标版本</p>
+                  <p className="mt-1 font-medium">{release.tag_name || '未找到'}</p>
+                </div>
+                <div>
+                  <p className="text-xs text-muted-foreground">发布时间</p>
+                  <p className="mt-1">
+                    {release.published_at
+                      ? `${formatRelativeTime(release.published_at)} · ${formatDateTime(release.published_at)}`
+                      : '—'}
+                  </p>
+                </div>
+              </div>
+              <p className="text-sm text-muted-foreground whitespace-pre-wrap">
+                {release.body || '暂无更新说明'}
+              </p>
+              {release.html_url ? (
+                <a
+                  href={release.html_url}
+                  target="_blank"
+                  rel="noreferrer"
+                  className="inline-flex items-center text-sm text-primary hover:underline"
+                >
+                  查看发布详情
+                  <ExternalLink className="size-3 ml-1" />
+                </a>
+              ) : null}
+            </div>
+          ) : null}
+        </div>
+
+        <DialogFooter className="gap-2 sm:gap-0">
+          <Button
+            type="button"
+            variant="outline"
+            disabled={submitting || releaseQuery.isFetching}
+            onClick={() => setChannel('stable')}
+          >
+            检查正式版
+          </Button>
+          <Button
+            type="button"
+            variant="outline"
+            disabled={submitting || releaseQuery.isFetching}
+            onClick={() => setChannel('preview')}
+          >
+            检查预览版
+          </Button>
+          <Button
+            type="button"
+            disabled={
+              submitting ||
+              releaseQuery.isFetching ||
+              !release?.has_update ||
+              node.update_requested
+            }
+            onClick={() => void onConfirm(release, channel)}
+          >
+            {submitting ? '下发中...' : channel === 'preview' ? '升级到预览版' : '升级到正式版'}
+          </Button>
+        </DialogFooter>
+      </DialogContent>
+    </Dialog>
+  );
+}