Adds in Mantis features. Enabling automated downloading of Mantises into the internal database, browsing of them, and viewing of attachments (including .msg files).

Resolves #14

package.json

@@ -14,6 +14,7 @@
   },
   "dependencies": {
     "@google/genai": "^0.9.0",
+    "@kenjiuno/msgreader": "^1.22.0",
     "@prisma/client": "^6.6.0",
     "@quasar/extras": "^1.16.4",
     "@quixo3/prisma-session-store": "^3.1.13",
@@ -22,6 +23,7 @@
     "axios": "^1.8.4",
     "better-sqlite3": "^11.9.1",
     "date-fns": "^4.1.0",
+    "dompurify": "^3.2.5",
     "dotenv": "^16.5.0",
     "express-session": "^1.18.1",
     "mailparser": "^3.7.2",