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

url-report.md

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+# Programmatic SEO URL Report
+
+Generated: 2026-04-09T05:14:30.010Z
+
+## Summary
+
+- **Total URLs**: 40
+- **Languages**: sr, en, de, fr
+- **Oils**: 5
+- **Concerns**: 9
+
+## URLs by Locale
+
+- **SR**: 10 URLs
+- **EN**: 10 URLs
+- **DE**: 10 URLs
+- **FR**: 10 URLs
+
+## URLs by Oil
+
+- **Argan Oil** (argan-oil): 12 URLs
+- **Rosehip Oil** (rosehip-oil): 12 URLs
+- **Jojoba Oil** (jojoba-oil): 8 URLs
+- **Sea Buckthorn Oil** (sea-buckthorn-oil): 4 URLs
+- **Sweet Almond Oil** (sweet-almond-oil): 4 URLs
+
+## URLs by Concern
+
+- **Wrinkles** (wrinkles): 8 URLs
+- **Dry Skin** (dry-skin): 4 URLs
+- **Acne** (acne): 4 URLs
+- **Oily Skin** (oily-skin): 4 URLs
+- **Dark Spots** (dark-spots): 4 URLs
+- **Hyperpigmentation** (hyperpigmentation): 4 URLs
+- **Acne Scars** (acne-scars): 4 URLs
+- **Under-Eye Bags** (under-eye-bags): 4 URLs
+- **Sensitive Skin** (sensitive-skin): 4 URLs
+
+## All Generated URLs
+
+### Argan Oil
+
+#### Wrinkles
+
+- SR: `https://manoonoils.com/solutions/arganovo-ulje-for-bore`
+- EN: `https://manoonoils.com/en/solutions/argan-oil-for-wrinkles`
+- DE: `https://manoonoils.com/de/solutions/arganoel-for-falten`
+- FR: `https://manoonoils.com/fr/solutions/huile-dargan-for-rides`
+
+#### Dry Skin
+
+- SR: `https://manoonoils.com/solutions/arganovo-ulje-for-suva-koza`
+- EN: `https://manoonoils.com/en/solutions/argan-oil-for-dry-skin`
+- DE: `https://manoonoils.com/de/solutions/arganoel-for-trockene-haut`
+- FR: `https://manoonoils.com/fr/solutions/huile-dargan-for-peau-seche`
+
+#### Under-Eye Bags
+
+- SR: `https://manoonoils.com/solutions/arganovo-ulje-for-podocnjaci`
+- EN: `https://manoonoils.com/en/solutions/argan-oil-for-under-eye-bags`
+- DE: `https://manoonoils.com/de/solutions/arganoel-for-augenringe`
+- FR: `https://manoonoils.com/fr/solutions/huile-dargan-for-cernes`
+
+### Rosehip Oil
+
+#### Wrinkles
+
+- SR: `https://manoonoils.com/solutions/ulje-divlje-ruze-for-bore`
+- EN: `https://manoonoils.com/en/solutions/rosehip-oil-for-wrinkles`
+- DE: `https://manoonoils.com/de/solutions/hagebuttenoel-for-falten`
+- FR: `https://manoonoils.com/fr/solutions/huile-de-rose-musquee-for-rides`
+
+#### Dark Spots
+
+- SR: `https://manoonoils.com/solutions/ulje-divlje-ruze-for-tamne-pjege`
+- EN: `https://manoonoils.com/en/solutions/rosehip-oil-for-dark-spots`
+- DE: `https://manoonoils.com/de/solutions/hagebuttenoel-for-dunkle-flecken`
+- FR: `https://manoonoils.com/fr/solutions/huile-de-rose-musquee-for-taches-sombres`
+
+#### Acne Scars
+
+- SR: `https://manoonoils.com/solutions/ulje-divlje-ruze-for-oziljci-od-akni`
+- EN: `https://manoonoils.com/en/solutions/rosehip-oil-for-acne-scars`
+- DE: `https://manoonoils.com/de/solutions/hagebuttenoel-for-aknenarben`
+- FR: `https://manoonoils.com/fr/solutions/huile-de-rose-musquee-for-cicatrices-dacne`
+
+### Jojoba Oil
+
+#### Acne
+
+- SR: `https://manoonoils.com/solutions/jojoba-ulje-for-akne`
+- EN: `https://manoonoils.com/en/solutions/jojoba-oil-for-acne`
+- DE: `https://manoonoils.com/de/solutions/jojobaoel-for-akne`
+- FR: `https://manoonoils.com/fr/solutions/huile-de-jojoba-for-acne`
+
+#### Oily Skin
+
+- SR: `https://manoonoils.com/solutions/jojoba-ulje-for-masna-koza`
+- EN: `https://manoonoils.com/en/solutions/jojoba-oil-for-oily-skin`
+- DE: `https://manoonoils.com/de/solutions/jojobaoel-for-fettige-haut`
+- FR: `https://manoonoils.com/fr/solutions/huile-de-jojoba-for-peau-grasse`
+
+### Sea Buckthorn Oil
+
+#### Hyperpigmentation
+
+- SR: `https://manoonoils.com/solutions/ulje-pasjeg-trna-for-hiperpigmentacija`
+- EN: `https://manoonoils.com/en/solutions/sea-buckthorn-oil-for-hyperpigmentation`
+- DE: `https://manoonoils.com/de/solutions/sanddornoel-for-hyperpigmentierung`
+- FR: `https://manoonoils.com/fr/solutions/huile-dargousier-for-hyperpigmentation`
+
+### Sweet Almond Oil
+
+#### Sensitive Skin
+
+- SR: `https://manoonoils.com/solutions/ulje-slatkog-badema-for-osetljiva-koza`
+- EN: `https://manoonoils.com/en/solutions/sweet-almond-oil-for-sensitive-skin`
+- DE: `https://manoonoils.com/de/solutions/suessmandeloel-for-empfindliche-haut`
+- FR: `https://manoonoils.com/fr/solutions/huile-damande-douce-for-peau-sensible`
+