feat: add PageRepository for Ghost Pages CRUD operations

Follows PostRepository pattern with AccountManager-based auth,
Dispatchers.IO coroutine context, and Result<T> return types.
Exposes fetchPages, createPage, updatePage, deletePage methods
plus getBlogUrl for constructing page URLs in the UI.

app/src/main/java/com/swoosh/microblog/data/repository/PageRepository.kt

@@ -0,0 +1,81 @@
+package com.swoosh.microblog.data.repository
+
+import android.content.Context
+import com.swoosh.microblog.data.AccountManager
+import com.swoosh.microblog.data.api.ApiClient
+import com.swoosh.microblog.data.api.GhostApiService
+import com.swoosh.microblog.data.model.GhostPage
+import com.swoosh.microblog.data.model.PageWrapper
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.withContext
+
+class PageRepository(private val context: Context) {
+
+    private val accountManager = AccountManager(context)
+
+    private fun getApi(): GhostApiService {
+        val account = accountManager.getActiveAccount()
+            ?: throw IllegalStateException("No active account configured")
+        return ApiClient.getService(account.blogUrl) { account.apiKey }
+    }
+
+    fun getBlogUrl(): String? {
+        return accountManager.getActiveAccount()?.blogUrl
+    }
+
+    suspend fun fetchPages(): Result<List<GhostPage>> =
+        withContext(Dispatchers.IO) {
+            try {
+                val response = getApi().getPages()
+                if (response.isSuccessful) {
+                    Result.success(response.body()!!.pages)
+                } else {
+                    Result.failure(Exception("API error ${response.code()}: ${response.errorBody()?.string()}"))
+                }
+            } catch (e: Exception) {
+                Result.failure(e)
+            }
+        }
+
+    suspend fun createPage(page: GhostPage): Result<GhostPage> =
+        withContext(Dispatchers.IO) {
+            try {
+                val response = getApi().createPage(PageWrapper(listOf(page)))
+                if (response.isSuccessful) {
+                    Result.success(response.body()!!.pages.first())
+                } else {
+                    Result.failure(Exception("Create failed ${response.code()}: ${response.errorBody()?.string()}"))
+                }
+            } catch (e: Exception) {
+                Result.failure(e)
+            }
+        }
+
+    suspend fun updatePage(id: String, page: GhostPage): Result<GhostPage> =
+        withContext(Dispatchers.IO) {
+            try {
+                val response = getApi().updatePage(id, PageWrapper(listOf(page)))
+                if (response.isSuccessful) {
+                    Result.success(response.body()!!.pages.first())
+                } else {
+                    Result.failure(Exception("Update failed ${response.code()}: ${response.errorBody()?.string()}"))
+                }
+            } catch (e: Exception) {
+                Result.failure(e)
+            }
+        }
+
+    suspend fun deletePage(id: String): Result<Unit> =
+        withContext(Dispatchers.IO) {
+            try {
+                val response = getApi().deletePage(id)
+                if (response.isSuccessful) {
+                    Result.success(Unit)
+                } else {
+                    Result.failure(Exception("Delete failed ${response.code()}"))
+                }
+            } catch (e: Exception) {
+                Result.failure(e)
+            }
+        }
+}