feat(deploy): enable Cloudflare Workers preview URLs with alias

- Add preview_urls = true to wrangler.toml
- Update deploy-preview.yml to use versions upload --preview-alias
- Implement new Cloudflare preview URL format with alias support

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

Author: ericyangpan

.github/workflows/deploy-preview.yml

@@ -38,12 +38,17 @@ jobs:
             CONTEXT_LABEL="Branch $RAW_BRANCH"
           fi
 
-          WORKER_NAME="aicodingstack-$CF_BRANCH"
-          PREVIEW_URL="https://${WORKER_NAME}.pr-preview.workers.dev"
+          # Cloudflare Preview URLs (aliased) format:
+          # <ALIAS>-<WORKER_NAME>.<SUBDOMAIN>.workers.dev
+          # See: https://developers.cloudflare.com/workers/configuration/previews/
+          PREVIEW_ALIAS="$CF_BRANCH"
+          WORKER_NAME="aicodingstack"
+          PREVIEW_URL="https://${PREVIEW_ALIAS}-${WORKER_NAME}.pr-preview.workers.dev"
 
           {
             echo "cf_branch=$CF_BRANCH"
             echo "worker_name=$WORKER_NAME"
+            echo "preview_alias=$PREVIEW_ALIAS"
             echo "preview_url=$PREVIEW_URL"
             echo "context_label=$CONTEXT_LABEL"
           } >> "$GITHUB_OUTPUT"
@@ -70,7 +75,7 @@ jobs:
         with:
           apiToken: ${{ secrets.CLOUDFLARE_API_TOKEN }}
           accountId: ${{ secrets.CLOUDFLARE_ACCOUNT_ID }}
-          command: deploy --branch ${{ steps.preview_meta.outputs.cf_branch }}
+          command: versions upload --preview-alias ${{ steps.preview_meta.outputs.preview_alias }}
 
       - name: Comment Preview URL
         if: github.event_name == 'pull_request'

wrangler.toml

@@ -1,6 +1,7 @@
 name = "aicodingstack"
 main = ".open-next/worker.js"
 compatibility_date = "2025-11-01"
+preview_urls = true
 compatibility_flags = [
   "nodejs_compat",
   "global_fetch_strictly_public",