feat(curation): auto-curation after crawl + quality messaging

Automate curation:
- Add runPostCrawlCuration() to DB queries — runs after every
  full and incremental crawl (classify, dedup, category counts)
- No more need for manual curate.mjs runs after each crawl

Quality messaging:
- Homepage stats label: "Skills" → "Curated Skills" (en/fa)
- Add curation note: "deduplicated and quality-filtered from X+ repos"
- Update fallback counts from 172K to 16K across all touchpoints
  (BetaBanner, getting-started prompts, email templates)
- getting-started skill count query now uses browse-ready filter

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

apps/web/messages/en.json

@@ -47,10 +47,11 @@
       "ctaSecondary": "Getting Started"
     },
     "stats": {
-      "skills": "Skills",
+      "skills": "Curated Skills",
       "downloads": "Downloads",
       "contributors": "Contributors",
-      "categories": "Categories"
+      "categories": "Categories",
+      "curationNote": "Every skill is deduplicated and quality-filtered from {totalIndexed}+ indexed repositories"
     },
     "featured": {
       "title": "Featured Skills",

apps/web/messages/fa.json

@@ -47,10 +47,11 @@
       "ctaSecondary": "راهنمای شروع"
     },
     "stats": {
-      "skills": "مهارت",
+      "skills": "مهارت برگزیده",
       "downloads": "دانلود",
       "contributors": "مشارکت‌کننده",
-      "categories": "دسته‌بندی"
+      "categories": "دسته‌بندی",
+      "curationNote": "هر مهارت از میان {totalIndexed}+ مخزن ایندکس‌شده، حذف تکراری و فیلتر کیفیت شده است"
     },
     "featured": {
       "title": "مهارت‌های ویژه",