Add deployment notes and patch artifacts

CUSTOM_REDEEM_SUBSCRIPTION.md

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+# Customization: subscription-capable redemption codes
+
+Base upstream commit: 677d02f2
+Local branch: codex/redeem-subscription
+Deployment dir: /root/docker/newapi
+
+What changed
+- Redemption codes support two modes: quota and subscription.
+- Subscription redemption creates user_subscriptions with source=redeem.
+- Admin redemption UI supports selecting a subscription plan.
+- User redemption response distinguishes quota vs subscription.
+
+Suggested future upgrade flow
+1. Pull latest upstream source into a clean clone.
+2. Re-apply the patch file in this folder.
+3. Resolve any merge conflicts in redemption/subscription files.
+4. Rebuild with: docker compose up -d --build new-api
+5. Verify with: curl http://127.0.0.1:3000/api/status
+
+Current compose note
+- This server is currently using source build mode instead of the official image.
+- Original compose backup: docker-compose.yml.bak-20260406094555