feat: add preview management, channel controls, invite polish, and recovery

- Auto-extract preview images from ZIP/RAR/7z archives during ingestion
- Upload custom preview images via package drawer
- Select preview from archive contents with on-demand extraction UI
- Manually add Telegram channels by t.me link, username, or invite link
- Invite code UX: bulk create, copy link, usage tracking, delete confirm
- Incomplete upload recovery: verify dest messages on worker startup
- Rebuild package DB by scanning destination channel with live progress

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/app/(auth)/register/page.tsx

@@ -100,7 +100,11 @@ export default function RegisterPage() {
                   <FormItem>
                     <FormLabel>Invite Code</FormLabel>
                     <FormControl>
-                      <Input placeholder="Enter your invite code" {...field} />
+                      <Input
+                        placeholder="Enter your invite code"
+                        autoComplete="off"
+                        {...field}
+                      />
                     </FormControl>
                     <FormMessage />
                   </FormItem>