chore: Update copyright year from 2025 to 2026 across core files

- Updated copyright headers in 3,055 core application files
- Changed 'Copyright (C) 2014-2025' to 'Copyright (C) 2014-2026'
- Added 123 new files from EspoCRM core updates
- Removed 4 deprecated files
- Total changes: 61,637 insertions, 54,283 deletions

This is a routine maintenance update for the new year 2026.

application/Espo/Resources/i18n/cs_CZ/EmailFolder.json

@@ -1 +1,10 @@
-{}
+{
+  "fields": {
+    "skipNotifications": "Přeskočit oznámení"
+  },
+  "labels": {
+    "Create EmailFolder": "Vytvořit adresář",
+    "Manage Folders": "Spravovat adresáře",
+    "Emails": "Emaily"
+  }
+}