feat: Add IndexNow submission and sitemap updates

- Add IndexNow submit script + state tracking
- Update deploy script to notify IndexNow after healthy deploy
- Publish IndexNow verification file in public
- Update sitemaps and add env placeholders
- Pass analytics/ads/IndexNow env vars into frontend build

.env.example

@@ -74,6 +74,11 @@ POSTGRES_PASSWORD=
 # Frontend
 VITE_SITE_DOMAIN=https://dociva.io
 VITE_SENTRY_DSN=
+INDEXNOW_KEY=
+INDEXNOW_ENDPOINT=https://www.bing.com/indexnow
+INDEXNOW_AUTO_SUBMIT=true
+INDEXNOW_STRICT=false
+INDEXNOW_FULL_SUBMIT=false
 
 # Frontend Analytics / Ads (Vite)
 VITE_GA_MEASUREMENT_ID=G-XXXXXXXXXX
@@ -85,10 +90,9 @@ VITE_ADSENSE_SLOT_HOME_TOP=1234567890
 VITE_ADSENSE_SLOT_HOME_BOTTOM=1234567891
 VITE_ADSENSE_SLOT_TOP_BANNER=1234567892
 VITE_ADSENSE_SLOT_BOTTOM_BANNER=1234567893
+VITE_CLARITY_PROJECT_ID=vzw2jb2ipq
 
 # Feature Flags (set to "false" to disable a specific tool)
 FEATURE_EDITOR=true
 FEATURE_OCR=true
 FEATURE_REMOVEBG=true
-
-VITE_CLARITY_PROJECT_ID=vzw2jb2ipq