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/metadata/entityDefs/EmailAccount.json

@@ -47,13 +47,21 @@
             "view": "views/email-account/fields/folders",
             "displayAsList": true,
             "noEmptyString": true,
-            "duplicateIgnore": true
+            "duplicateIgnore": true,
+            "tooltip": true,
+            "fullNameAdditionalAttributeList": ["folderMap"]
         },
         "sentFolder": {
             "type": "varchar",
             "view": "views/email-account/fields/folder",
             "duplicateIgnore": true
         },
+        "folderMap": {
+            "type": "jsonObject",
+            "validatorClassNameList": [
+                "Espo\\Classes\\FieldValidators\\EmailAccount\\FolderMap\\Valid"
+            ]
+        },
         "storeSentEmails": {
             "type": "bool",
             "tooltip": true