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/(docs)/docs/privacy-policy/page.tsx

@@ -0,0 +1,20 @@
+import {LegalPageLayout} from "@/components/common/docs/legal-page-layout"
+import {privacySections} from "@/components/common/docs/privacy"
+import {TERMS_LAST_UPDATED} from "@/components/common/docs/terms"
+
+export default function PrivacyPolicyPage() {
+  return (
+    <LegalPageLayout
+      title="隐私政策 (Privacy)"
+      lastUpdated={TERMS_LAST_UPDATED}
+      sections={privacySections}
+      description={
+        <span>
+          我们非常重视您的隐私保护。本政策将向您透明地展示我们如何收集、使用、存储您的个人信息，
+          <br className="hidden md:block" />
+          以及您享有的相关权利。
+        </span>
+      }
+    />
+  )
+}