feat: implement centralized taxonomy for programmatic SEO

- Create taxonomy system with oils.json (5 oils) and concerns.json (9 concerns)
- Migrate 10 content files to new data/content/oil-for-concern/ structure
- Add scripts: generate-urls.js, validate-taxonomy.js, migrate-content.js
- Update dataLoader.ts to use centralized taxonomy
- Generate 40 URLs (10 pairs × 4 languages)
- Create sitemap-programmatic.xml for SEO
- Update by-oil and by-concern directory pages

scripts/migrate-content.js

@@ -0,0 +1,106 @@
+const fs = require('fs');
+const path = require('path');
+
+const oils = require('../data/taxonomy/oils.json');
+const concerns = require('../data/taxonomy/concerns.json');
+
+const LOCALES = ['sr', 'en', 'de', 'fr'];
+
+const legacyFiles = [
+  { file: 'najbolje-arganovo-ulje-za-bore.json', oil: 'argan-oil', concern: 'wrinkles' },
+  { file: 'najbolje-arganovo-ulje-za-suvu-kozu.json', oil: 'argan-oil', concern: 'dry-skin' },
+  { file: 'najbolje-arganovo-ulje-za-podocnjake.json', oil: 'argan-oil', concern: 'under-eye-bags' },
+  { file: 'najbolje-ulje-divlje-ruze-za-bore.json', oil: 'rosehip-oil', concern: 'wrinkles' },
+  { file: 'najbolje-ulje-divlje-ruze-za-tamne-pjege.json', oil: 'rosehip-oil', concern: 'dark-spots' },
+  { file: 'najbolje-ulje-divlje-ruze-za-oziljke-od-akni.json', oil: 'rosehip-oil', concern: 'acne-scars' },
+  { file: 'najbolje-jojoba-ulje-za-akne.json', oil: 'jojoba-oil', concern: 'acne' },
+  { file: 'najbolje-jojoba-ulje-za-masnu-kozu.json', oil: 'jojoba-oil', concern: 'oily-skin' },
+  { file: 'najbolje-ulje-pasjeg-trna-za-hiperpigmentaciju.json', oil: 'sea-buckthorn-oil', concern: 'hyperpigmentation' },
+  { file: 'najbolje-ulje-slatkog-badema-za-osetljivu-kozu.json', oil: 'sweet-almond-oil', concern: 'sensitive-skin' }
+];
+
+function extractContent(oldData) {
+  return {
+    schema: {
+      version: "1.0.0",
+      type: "oil-for-concern",
+      oilId: oldData.oilSlug,
+      concernId: oldData.concernSlug
+    },
+    content: {
+      whyThisWorks: oldData.whyThisWorks,
+      keyBenefits: oldData.keyBenefits,
+      howToApply: oldData.howToApply,
+      expectedResults: oldData.expectedResults,
+      timeframe: oldData.timeframe
+    },
+    metadata: {
+      productsToShow: oldData.productsToShow || [],
+      complementaryIngredients: oldData.complementaryIngredients || [],
+      customerResults: (oldData.customerResults || []).map(r => ({
+        quote: r.quote,
+        name: r.name,
+        age: r.age,
+        skinType: r.skinType,
+        timeframe: r.timeframe
+      })),
+      faqs: (oldData.faqs || []).map(f => ({
+        question: f.question,
+        answer: f.answer
+      })),
+      seoKeywords: oldData.seoKeywords || {},
+      relatedPages: oldData.relatedPages || {
+        otherOilsForSameConcern: [],
+        sameOilForOtherConcerns: []
+      }
+    }
+  };
+}
+
+function migrateFiles() {
+  const sourceDir = path.join(__dirname, '../data/oil-for-concern');
+  const targetDir = path.join(__dirname, '../data/content/oil-for-concern');
+  
+  if (!fs.existsSync(targetDir)) {
+    fs.mkdirSync(targetDir, { recursive: true });
+  }
+  
+  let migrated = 0;
+  let errors = [];
+  
+  for (const mapping of legacyFiles) {
+    const sourcePath = path.join(sourceDir, mapping.file);
+    const targetFilename = `${mapping.oil}-${mapping.concern}.json`;
+    const targetPath = path.join(targetDir, targetFilename);
+    
+    if (!fs.existsSync(sourcePath)) {
+      errors.push(`Source file not found: ${mapping.file}`);
+      continue;
+    }
+    
+    try {
+      const oldData = JSON.parse(fs.readFileSync(sourcePath, 'utf8'));
+      const newData = extractContent(oldData);
+      
+      fs.writeFileSync(targetPath, JSON.stringify(newData, null, 2));
+      console.log(`✓ Migrated: ${mapping.file} → ${targetFilename}`);
+      migrated++;
+    } catch (err) {
+      errors.push(`Error migrating ${mapping.file}: ${err.message}`);
+    }
+  }
+  
+  console.log(`\n=== MIGRATION COMPLETE ===`);
+  console.log(`Migrated: ${migrated}/${legacyFiles.length} files`);
+  
+  if (errors.length > 0) {
+    console.log(`\nErrors (${errors.length}):`);
+    errors.forEach(e => console.log(`  - ${e}`));
+  }
+}
+
+if (require.main === module) {
+  migrateFiles();
+}
+
+module.exports = { extractContent, migrateFiles };