Migrate from xlsx to exceljs to fix security vulnerabilities

- Replace xlsx package (v0.18.5) with exceljs (v4.4.0)
- Remove @types/xlsx dependency (exceljs has built-in TypeScript types)
- Update biaMatchingService.ts to use ExcelJS API:
  - Replace XLSX.read() with workbook.xlsx.load()
  - Replace XLSX.utils.sheet_to_json() with eachRow() iteration
  - Handle 1-based column indexing correctly
- Make loadBIAData() and findBIAMatch() async functions
- Update all callers in applications.ts and claude.ts to use await
- Fix npm audit: 0 vulnerabilities (was 1 high severity)

This migration eliminates the Prototype Pollution and ReDoS vulnerabilities
in the xlsx package while maintaining full functionality.

backend/package.json

@@ -1,7 +1,7 @@
 {
-  "name": "zira-backend",
+  "name": "cmdb-insight-backend",
   "version": "1.0.0",
-  "description": "ZiRA Classificatie Tool Backend",
+  "description": "CMDB Insight Backend",
   "type": "module",
   "main": "dist/index.js",
   "scripts": {
@@ -29,7 +29,7 @@
     "openai": "^6.15.0",
     "pg": "^8.13.1",
     "winston": "^3.17.0",
-    "xlsx": "^0.18.5"
+    "exceljs": "^4.4.0"
   },
   "devDependencies": {
     "@types/better-sqlite3": "^7.6.12",
@@ -38,7 +38,6 @@
     "@types/express": "^5.0.0",
     "@types/node": "^22.9.0",
     "@types/pg": "^8.11.10",
-    "@types/xlsx": "^0.0.35",
     "tsx": "^4.19.2",
     "typescript": "^5.6.3"
   }