fix: добавить postbuild.js для копирования статических файлов

- scripts/postbuild.js: новый скрипт для копирования public и .next/static в .next/standalone
- package.json: запуск postbuild.js после npm run build
- scripts/install.sh: использование postbuild.js вместо ручного копирования
- scripts/manage.sh: использование postbuild.js вместо ручного копирования
- next.config.js: убран outputFileTracingRoot (не работает в Next.js 16)

Теперь стили и статические файлы должны корректно работать в продакшене

scripts/postbuild.js

@@ -0,0 +1,88 @@
+#!/usr/bin/env node
+
+/**
+ * Post-build script for Next.js standalone mode
+ * Copies public and .next/static files to .next/standalone directory
+ */
+
+const fs = require('fs');
+const path = require('path');
+
+const ROOT_DIR = process.cwd();
+const STANDALONE_DIR = path.join(ROOT_DIR, '.next', 'standalone');
+const PUBLIC_DIR = path.join(ROOT_DIR, 'public');
+const NEXT_STATIC_DIR = path.join(ROOT_DIR, '.next', 'static');
+const STANDALONE_PUBLIC_DIR = path.join(STANDALONE_DIR, 'public');
+const STANDALONE_NEXT_STATIC_DIR = path.join(STANDALONE_DIR, '.next', 'static');
+
+// Helper function to copy directory recursively
+function copyDir(src, dest) {
+  if (!fs.existsSync(src)) {
+    console.error(`Source directory does not exist: ${src}`);
+    return false;
+  }
+
+  if (!fs.existsSync(dest)) {
+    fs.mkdirSync(dest, { recursive: true });
+  }
+
+  const entries = fs.readdirSync(src, { withFileTypes: true });
+
+  for (const entry of entries) {
+    const srcPath = path.join(src, entry.name);
+    const destPath = path.join(dest, entry.name);
+
+    if (entry.isDirectory()) {
+      copyDir(srcPath, destPath);
+    } else {
+      fs.copyFileSync(srcPath, destPath);
+    }
+  }
+
+  return true;
+}
+
+// Helper function to remove directory recursively
+function removeDir(dir) {
+  if (fs.existsSync(dir)) {
+    fs.rmSync(dir, { recursive: true, force: true });
+  }
+}
+
+console.log('Post-build: Setting up standalone directory...');
+
+// Check if standalone directory exists
+if (!fs.existsSync(STANDALONE_DIR)) {
+  console.error('Error: .next/standalone directory not found!');
+  console.error('Make sure output: "standalone" is set in next.config.js');
+  process.exit(1);
+}
+
+// Copy public directory
+if (fs.existsSync(PUBLIC_DIR)) {
+  console.log(`Copying ${PUBLIC_DIR} to ${STANDALONE_PUBLIC_DIR}...`);
+  removeDir(STANDALONE_PUBLIC_DIR);
+  if (copyDir(PUBLIC_DIR, STANDALONE_PUBLIC_DIR)) {
+    console.log('✓ Public directory copied');
+  } else {
+    console.error('✗ Failed to copy public directory');
+  }
+} else {
+  console.warn('Warning: public directory not found');
+}
+
+// Copy .next/static directory
+if (fs.existsSync(NEXT_STATIC_DIR)) {
+  console.log(`Copying ${NEXT_STATIC_DIR} to ${STANDALONE_NEXT_STATIC_DIR}...`);
+  removeDir(STANDALONE_NEXT_STATIC_DIR);
+  if (copyDir(NEXT_STATIC_DIR, STANDALONE_NEXT_STATIC_DIR)) {
+    console.log('✓ .next/static directory copied');
+  } else {
+    console.error('✗ Failed to copy .next/static directory');
+  }
+} else {
+  console.error('Error: .next/static directory not found!');
+  process.exit(1);
+}
+
+console.log('Post-build: Done!');