Migrate from Vite to Next.js 15 with SSR

- Replace Vite + React Router with Next.js 15 App Router
- Implement i18n with next-intl (URL-based: /de, /en, /sr)
- Add SSR/SSG for all pages (48 static pages generated)
- Setup Supabase SSR client for auth
- Migrate all pages: Home, About, Portfolio, Blog, Contact, Login, Dashboard, Imprint, Privacy, Terms
- Add Docker support with standalone output
- Replace i18next with next-intl JSON translations
- Use next/image for optimized images

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

scripts/convert-translations.js

@@ -0,0 +1,43 @@
+/**
+ * Script to convert TypeScript translations to JSON for next-intl
+ * Run with: node scripts/convert-translations.js
+ */
+
+import fs from 'fs';
+import path from 'path';
+import { fileURLToPath } from 'url';
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = path.dirname(__filename);
+
+const locales = ['de', 'en', 'sr'];
+
+async function convertTranslations() {
+  for (const locale of locales) {
+    console.log(`Converting ${locale} translations...`);
+
+    try {
+      // Dynamically import the translations
+      const translations = await import(`../src/i18n/locales/${locale}/index.ts`);
+      const data = translations.default || translations;
+
+      // Output directory
+      const outputDir = path.join(__dirname, '..', 'src', 'messages');
+      if (!fs.existsSync(outputDir)) {
+        fs.mkdirSync(outputDir, { recursive: true });
+      }
+
+      // Write JSON file
+      const outputPath = path.join(outputDir, `${locale}.json`);
+      fs.writeFileSync(outputPath, JSON.stringify(data, null, 2), 'utf-8');
+
+      console.log(`  ✓ Saved to ${outputPath}`);
+    } catch (error) {
+      console.error(`  ✗ Error converting ${locale}:`, error.message);
+    }
+  }
+
+  console.log('\nConversion complete!');
+}
+
+convertTranslations();