feat: add FTP and SFTP upload support

frontend/src/App.vue

@@ -22,6 +22,7 @@ import {
   CopyRegionImage,
   SaveRegionImage,
   SaveRegionToRemote,
+  UploadRegionToFTP,
   SummarizeRegion,
   ExtractTextRegion,
   CancelRegion,
@@ -59,7 +60,7 @@ async function loadThemePreference() {
 // `SettingsTab` is hoisted to the App shell so the sidebar (which lives
 // here) and the inner SettingsView (which renders the matching card) can
 // share a single source of truth without an event bus.
-type SettingsTab = 'general' | 's3' | 'ssh' | 'llm' | 'ocr'
+type SettingsTab = 'general' | 's3' | 'ftp' | 'ssh' | 'llm' | 'ocr'
 const activeTab = ref<SettingsTab>('general')
 
 // Sidebar entries are declarative so adding a destination type later is
@@ -67,6 +68,7 @@ const activeTab = ref<SettingsTab>('general')
 const sidebarItems: Array<{ id: SettingsTab; label: string }> = [
   { id: 'general', label: '通用设置' },
   { id: 's3', label: '对象存储' },
+  { id: 'ftp', label: 'FTP / SFTP' },
   { id: 'ssh', label: '远程主机' },
   { id: 'llm', label: '智能识图' },
   { id: 'ocr', label: '文字提取' },
@@ -184,6 +186,16 @@ async function onOverlaySaveRemote(rect: OverlayResult) {
   }
 }
 
+async function onOverlayUploadFTP(rect: OverlayResult) {
+  mode.value = 'settings'
+  overlayPayload.value = null
+  try {
+    await UploadRegionToFTP(rect as any)
+  } catch {
+    /* Surfaced via upload:failure */
+  }
+}
+
 async function onOverlaySummarize(rect: OverlayResult) {
   mode.value = 'settings'
   overlayPayload.value = null
@@ -275,6 +287,7 @@ onUnmounted(() => {
     @copy="onOverlayCopy"
     @save="onOverlaySave"
     @save-remote="onOverlaySaveRemote"
+    @upload-ftp="onOverlayUploadFTP"
     @summarize="onOverlaySummarize"
     @ocr="onOverlayOCR"
     @cancel="onOverlayCancel"