feat: export a import kampani a cenoviek pre prenos na novy server

- npm run db:export: kampane a sablony cenoviek do supabase/data/ (+ obrazky z uloziska)
- npm run db:import [-- --dry-run]: nahra data s povodnymi ID, prepise odkazy
  na nove ulozisko, da sa spustit opakovane
- aktualny export: 7 kampani, 1 sablona cenovky

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

supabase/data/badges.json

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+[
+  {
+    "id": "57384db9-7751-4e36-898d-b8b19f2a1f63",
+    "name": "Super cena so zlovaou",
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+      "layers": [
+        {
+          "x": 39,
+          "y": 82,
+          "id": "l-1790245126860-2",
+          "fill": "#ffffff",
+          "text": "{cena}",
+          "type": "text",
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+          "fontFamily": "Aptly",
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+        {
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+]

supabase/data/meta.json

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+{
+  "exportedAt": "2026-10-19T08:59:25.680Z",
+  "sourceStorageBase": "https://dqexxfspkylqttrtxsww.supabase.co/storage/v1/object/public/newsletter-assets/"
+}