Rename EMAILBRO → ASPEKTER, update Coin Scout, security fixes

- Rename: Docker containers, UI, nginx, User-Agent strings
- Coin Scout: sync from COIN_SCOUT project (latest version)
- Security: Pug injection protection (validatePugSafety)
- Security: concurrent render fix (unique temp files)
- Fix: disappearing IDs input when cleared
- Audit logging: all mutations, login/logout
- Users: createdBy/updatedBy on letters
- Local image storage option

coin-scout/package.json

@@ -9,6 +9,7 @@
     "express": "^4.18.2",
     "better-sqlite3": "^11.0.0",
     "node-cron": "^3.0.3",
-    "node-html-parser": "^6.1.13"
+    "node-html-parser": "^6.1.13",
+    "sharp": "^0.33.0"
   }
 }