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/zh_CN/Extension.json

@@ -1,15 +1,16 @@
-{
-  "fields": {
-    "name": "名称",
-    "version": "版本",
-    "description": "描述",
-    "isInstalled": "已安装"
-  },
-  "labels": {
-    "Uninstall": "卸载",
-    "Install": "安装"
-  },
-  "messages": {
-    "uninstalled": "扩展{name}已卸载"
-  }
+{
+  "fields": {
+    "name": "名称",
+    "version": "版本",
+    "description": "描述",
+    "isInstalled": "已安装",
+    "checkVersionUrl": "检查新版本的网址"
+  },
+  "labels": {
+    "Uninstall": "卸载",
+    "Install": "安装"
+  },
+  "messages": {
+    "uninstalled": "扩展 {name} 已卸载"
+  }
 }