feat: expose archive entries in fsScanner

- Añade `scanDirectory` support para listar entradas internas de ZIP/7z
- Añade test unitario que mockea `archiveReader.listArchiveEntries`
- Añade límite configurable `ARCHIVE_MAX_ENTRIES` y comprobación básica de seguridad

backend/src/services/fsScanner.ts

@@ -13,9 +13,13 @@
 import path from 'path';
 import { promises as fsPromises } from 'fs';
 import { detectFormat } from '../lib/fileTypeDetector';
+import { listArchiveEntries } from './archiveReader';
+
+const ARCHIVE_MAX_ENTRIES = Number(process.env.ARCHIVE_MAX_ENTRIES) || 1000;
 
 export async function scanDirectory(dirPath: string): Promise<any[]> {
   const results: any[] = [];
+  let archiveEntriesAdded = 0;
 
   async function walk(dir: string) {
     const entries = await fsPromises.readdir(dir, { withFileTypes: true });
@@ -43,6 +47,35 @@ export async function scanDirectory(dirPath: string): Promise<any[]> {
           format,
           isArchive,
         });
+
+        if (isArchive) {
+          try {
+            const entries = await listArchiveEntries(full);
+
+            for (const e of entries) {
+              if (archiveEntriesAdded >= ARCHIVE_MAX_ENTRIES) break;
+              if (!e || !e.name) continue;
+              // avoid path traversal or absolute paths
+              if (e.name.includes('..') || path.isAbsolute(e.name)) continue;
+
+              results.push({
+                path: `${full}::${e.name}`,
+                containerPath: full,
+                entryPath: e.name,
+                filename: path.basename(e.name),
+                name: e.name,
+                size: e.size,
+                format: detectFormat(e.name),
+                isArchive: false,
+                isArchiveEntry: true,
+              });
+
+              archiveEntriesAdded++;
+            }
+          } catch (err) {
+            // ignore archive listing errors
+          }
+        }
       }
     }
   }