feat(bookstack) : add frontend BookStack DTOs

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/services/dto/bookstack.ts

@@ -0,0 +1,42 @@
+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
+}