fix: vynechani .env souboru pri kopirovani do dist

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

vite.config.js

@@ -4,11 +4,16 @@ import { defineConfig } from 'vite'
   import { execSync } from 'child_process'
   import { resolve, join } from 'path'
 
+  const COPY_SKIP = new Set(['.env', '.env.local', '.env.production'])
+
   function copyFolderSync(src, dest) {
     mkdirSync(dest, { recursive: true })
     const entries = readdirSync(src)
 
     for (const entry of entries) {
+      if (COPY_SKIP.has(entry)) {
+        continue
+      }
       const srcPath = join(src, entry)
       const destPath = join(dest, entry)