feat(integration) : extract Gitea/BookStack/Zimbra/Share front into module layer

LST-68 (2.6) front. Completes the Integration module and Phase 2.

- New frontend/modules/integration/ layer (auto-detected): services
  (gitea, bookstack, zimbra, share, share-settings) + their DTOs, and the
  useShareStatus composable.
- Consumers repointed to ~/modules/integration/...: admin tabs
  (Gitea/BookStack/Zimbra/Share), PM task sections (TaskGitSection,
  TaskBookStackLinks, TaskDocumentShareLinker), ProjectDrawer, TaskModal,
  pages/documents.vue, components/share/SharedFilePreview.vue.
- Admin tabs, SharedFilePreview and documents/admin pages stay at their
  location (only imports updated). i18n stays global.

nuxt build passes; all routes preserved.

frontend/services/dto/bookstack.ts

@@ -1,42 +0,0 @@
-export type BookStackSettings = {
-    url: string | null
-    hasToken: boolean
-}
-
-export type BookStackSettingsWrite = {
-    url: string | null
-    tokenId: string | null
-    tokenSecret: string | null
-}
-
-export type BookStackTestResult = {
-    success: boolean
-}
-
-export type BookStackShelf = {
-    id: number
-    name: string
-}
-
-export type BookStackLink = {
-    id: number
-    bookstackId: number
-    bookstackType: 'page' | 'book'
-    title: string
-    url: string
-    createdAt: string
-}
-
-export type BookStackLinkCreate = {
-    bookstackId: number
-    bookstackType: 'page' | 'book'
-    title: string
-    url: string
-}
-
-export type BookStackSearchResult = {
-    id: number
-    type: 'page' | 'book'
-    name: string
-    url: string
-}

frontend/services/dto/gitea.ts

@@ -1,57 +0,0 @@
-export type GiteaSettings = {
-    url: string | null
-    hasToken: boolean
-}
-
-export type GiteaSettingsWrite = {
-    url: string | null
-    token: string | null
-}
-
-export type GiteaRepository = {
-    fullName: string
-    name: string
-    owner: string
-}
-
-export type GiteaBranch = {
-    name: string
-    commits: GiteaCommit[]
-}
-
-export type GiteaCommit = {
-    sha: string
-    message: string
-    author: string
-    date: string
-}
-
-export type GiteaBranchCreate = {
-    type: string
-    baseBranch: string
-}
-
-export type GiteaPullRequest = {
-    number: number
-    title: string
-    state: string
-    merged: boolean
-    headBranch: string
-    author: string
-    url: string
-    ciStatuses: GiteaCiStatus[]
-}
-
-export type GiteaCiStatus = {
-    context: string
-    status: string
-    target_url: string
-}
-
-export type GiteaBranchName = {
-    name: string
-}
-
-export type GiteaTestResult = {
-    success: boolean
-}

frontend/services/dto/share.ts

@@ -1,53 +0,0 @@
-export type FileEntry = {
-    name: string
-    path: string
-    isDir: boolean
-    size: number
-    modifiedAt: number | null
-    mimeType: string
-}
-
-export type Breadcrumb = {
-    name: string
-    path: string
-}
-
-export type ShareBrowseResult = {
-    path: string
-    breadcrumb: Breadcrumb[]
-    entries: FileEntry[]
-}
-
-export type ShareSearchResult = {
-    query: string
-    entries: FileEntry[]
-}
-
-export type ShareStatus = {
-    enabled: boolean
-}
-
-export type ShareSettings = {
-    host: string | null
-    shareName: string | null
-    basePath: string | null
-    domain: string | null
-    username: string | null
-    enabled: boolean
-    hasPassword: boolean
-}
-
-export type ShareSettingsWrite = {
-    host: string | null
-    shareName: string | null
-    basePath: string | null
-    domain: string | null
-    username: string | null
-    password?: string | null
-    enabled: boolean
-}
-
-export type ShareTestResult = {
-    success: boolean
-    message: string | null
-}

frontend/services/dto/zimbra.ts

@@ -1,19 +0,0 @@
-export type ZimbraSettings = {
-    serverUrl: string | null
-    username: string | null
-    calendarPath: string | null
-    enabled: boolean
-    hasPassword: boolean
-}
-
-export type ZimbraSettingsWrite = {
-    serverUrl: string | null
-    username: string | null
-    calendarPath: string | null
-    password?: string | null
-    enabled: boolean
-}
-
-export type ZimbraTestResult = {
-    success: boolean
-}