feat: Gitea 프론트 연동(클론바·원격없음 배지)·import-admin 인프라 마무리

- GiteaRepoBar 컴포넌트(클론 주소 복사 + Gitea 열기)를 RepoSettingsPage 에 적용
- repo.store 뷰에 cloneUrl/htmlUrl/giteaMissing 매핑
- repo-sync: import 저장소 owner-admin 자동 지정(REPO_IMPORT_ADMIN_EMAIL)
- env example·docker-compose.dev 에 Gitea/import-admin 키 정비

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

frontend/src/pages/relay/RepoSettingsPage.vue

@@ -5,6 +5,7 @@ import { useRoute, useRouter, RouterLink } from 'vue-router'
 import AppShell from '@/layouts/AppShell.vue'
 import RepoHeader from '@/components/RepoHeader.vue'
 import RepoTabs from '@/components/RepoTabs.vue'
+import GiteaRepoBar from '@/components/GiteaRepoBar.vue'
 import { useRepoStore } from '@/stores/repo.store'
 import { type Repo, type Visibility } from '@/mock/relay.mock'
 
@@ -181,6 +182,11 @@ function renameRepo() {
                 /><path d="M7 11V7a5 5 0 0 1 10 0v4" /></svg>
               </span>
             </div>
+            <GiteaRepoBar
+              :clone-url="repo.cloneUrl"
+              :html-url="repo.htmlUrl"
+              class="gitea-bar-spacing"
+            />
           </div>
 
           <div class="fblock">
@@ -449,6 +455,10 @@ textarea.tarea {
   height: auto;
 }
 
+.gitea-bar-spacing {
+  margin-top: 0.6875rem;
+}
+
 .readonly {
   display: flex;
   align-items: center;