ci: target the repo's existing 'prod' environment

The repo defines environments 'dev' and 'prod'; the workflow referenced a
'production' environment that does not exist.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GaLeuxVikb3iH2Etw2tHe7

Author: codebam

.github/workflows/deploy.yml

@@ -64,7 +64,7 @@ jobs:
     if: startsWith(github.ref, 'refs/tags/bot-v')
     needs: check
     runs-on: ubuntu-latest
-    environment: production
+    environment: prod
     steps:
       - uses: actions/checkout@v4
         with:
@@ -92,7 +92,7 @@ jobs:
     if: startsWith(github.ref, 'refs/tags/webapp-v')
     needs: check
     runs-on: ubuntu-latest
-    environment: production
+    environment: prod
     steps:
       - uses: actions/checkout@v4
         with: