fix: update portal-stats.json with corrected numbers (251 datasets, 648K proteins, 53 species)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: ypriverol

data/portal-stats.json

@@ -1,9 +1,9 @@
 {
-  "generated_at": "2026-04-11T00:00:00Z",
-  "datasets": 252,
+  "generated_at": "2026-04-11T06:00:00Z",
+  "datasets": 251,
   "collections": 4,
-  "organisms": 10,
-  "proteins": 633719,
+  "organisms": 53,
+  "proteins": 648023,
   "psms": 500511663,
   "source": "portal.quantms.org"
 }