feat: add modular daily cron system with storage cleanup and orphan detection

.env.example

@@ -50,13 +50,20 @@ DISCORD_CLIENT_ID=""
 DISCORD_CLIENT_SECRET=""
 
 # -----------------------------------------------------------------------------
-# STORAGE (R2)
+# STORAGE (CLOUDFLARE R2)
 # -----------------------------------------------------------------------------
-R2_ACCOUNT_ID="account_id_here"
-R2_ACCESS_KEY_ID="access_key_id_here"
-R2_SECRET_ACCESS_KEY="secret_access_key_here"
-R2_BUCKET_NAME="deckyvault"
-R2_PUBLIC_URL="https://cdn.deckyvault.xyz"
+R2_ACCOUNT_ID=
+R2_ACCESS_KEY_ID=
+R2_SECRET_ACCESS_KEY=
+R2_BUCKET_NAME=deckyvault
+R2_PUBLIC_URL=
+
+# -----------------------------------------------------------------------------
+# CRON
+# -----------------------------------------------------------------------------
+# Secret token for daily cron endpoint (generate with: openssl rand -base64 32)
+# Leave empty to disable cron endpoints
+CRON_SECRET=
 
 # -----------------------------------------------------------------------------
 # PASSKEY (WebAuthn)
@@ -88,12 +95,3 @@ STEAMGRIDDB_API_KEY="your_steamgriddb_api_key_here"
 # Discord webhook URL for contact/report submissions
 DISCORD_WEBHOOK_URL=""
 
-# -----------------------------------------------------------------------------
-# SITEMAP
-# -----------------------------------------------------------------------------
-# Secret token for on-demand sitemap revalidation (generate with: openssl rand -base64 32)
-# Leave empty to disable the revalidation endpoint
-REVALIDATE_SECRET=""
-
-# ISR revalidation interval in seconds for sitemap.xml (default: 3600 = 1 hour)
-SITEMAP_REVALIDATE_SECONDS=""