feat: add POST /api/documents/register-local for extension import

Accepts pre-extracted text (no raw file) from the AyrisLegal Electron
app's local OCR pipeline, matches/creates a case by title, and runs
the existing AI analysis flow. Also fixes a bug in uploadDocument:
officeparser@7.x's parseOffice() now returns a result object with
.toText() instead of a plain string, which was breaking PDF/DOCX
manual uploads.

src/routes/document.routes.ts

@@ -1,11 +1,12 @@
 import { Router } from 'express';
 import multer from 'multer';
 import { requireAuth } from '../middleware/auth';
-import { uploadDocument } from '../controllers/document.controller';
+import { uploadDocument, registerLocalDocument } from '../controllers/document.controller';
 
 const router = Router();
 const upload = multer({ storage: multer.memoryStorage() });
 
 router.post('/upload', upload.single('file'), requireAuth, uploadDocument);
+router.post('/register-local', requireAuth, registerLocalDocument);
 
 export default router;