chore(rebase): realign duplicate backend/channel/schema files with main

src/channels/line/adapter.ts

@@ -169,19 +169,6 @@ export class LineAdapter implements ChannelAdapter {
     } finally {
       await rm(tempDir, { recursive: true, force: true });
     }
-
-    if (message.attachments && message.attachments.length > 0) {
-      for (const attachment of message.attachments) {
-        if (attachment.url) {
-          const line = attachment.filename ? `${attachment.filename}: ${attachment.url}` : attachment.url;
-          await this.sendPush(peerId, line);
-          continue;
-        }
-        if (attachment.data) {
-          console.warn(`LINE: skipping attachment data (${attachment.mimeType}) — upload not implemented`);
-        }
-      }
-    }
   }
 
   async handleRequest(req: IncomingMessage, res: ServerResponse): Promise<void> {

src/channels/signal/adapter.ts

@@ -388,27 +388,3 @@ function sanitizeFilename(filename?: string): string {
 function escapeRegex(value: string): string {
   return value.replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
 }
-
-function sanitizeFilename(name?: string): string {
-  if (!name) {
-    return '';
-  }
-  return name.replace(/[^a-zA-Z0-9._-]/g, '_').slice(0, 100);
-}
-
-function extensionFromMimeType(mimeType?: string): string {
-  if (!mimeType) {
-    return '';
-  }
-  const simple = mimeType.split('/')[1]?.trim().toLowerCase();
-  if (!simple) {
-    return '';
-  }
-  if (simple.includes('jpeg')) {
-    return '.jpg';
-  }
-  if (simple.includes('plain')) {
-    return '.txt';
-  }
-  return `.${simple.replace(/[^a-z0-9]/g, '')}`;
-}

src/channels/zalo/adapter.ts

@@ -159,19 +159,6 @@ export class ZaloAdapter implements ChannelAdapter {
     } finally {
       await rm(tempDir, { recursive: true, force: true });
     }
-
-    if (message.attachments && message.attachments.length > 0) {
-      for (const attachment of message.attachments) {
-        if (attachment.url) {
-          const line = attachment.filename ? `${attachment.filename}: ${attachment.url}` : attachment.url;
-          await this.sendText(peerId, line);
-          continue;
-        }
-        if (attachment.data) {
-          console.warn(`Zalo: skipping attachment data (${attachment.mimeType}) — upload not implemented`);
-        }
-      }
-    }
   }
 
   async handleRequest(req: IncomingMessage, res: ServerResponse): Promise<void> {