fix: Remove dynamic year from copyright in generated files (#1131)

The year was generated using `new Date().getFullYear()`, causing CI validation
failures when the year changes (checked-in files say 2025 but regenerated files
say 2026).

Author: mfazekas

packages/nitrogen/src/syntax/helpers.ts

@@ -11,13 +11,12 @@ export function createFileMetadataString(
   filename: string,
   comment: Comment = '///'
 ): string {
-  const now = new Date()
   return `
 ${comment}
 ${comment} ${filename}
 ${comment} This file was generated by nitrogen. DO NOT MODIFY THIS FILE.
 ${comment} https://github.com/mrousavy/nitro
-${comment} Copyright © ${now.getFullYear()} Marc Rousavy @ Margelo
+${comment} Copyright © Marc Rousavy @ Margelo
 ${comment}
 `.trim()
 }