feat: wire Resend mail and Cloudflare R2 storage

Add production provider deps/config so transactional email and CMS
media can use Resend and a dedicated r2 disk with custom-domain URLs.

Co-authored-by: Cursor <cursoragent@cursor.com>

.env.example

@@ -53,6 +53,7 @@ REDIS_HOST=127.0.0.1
 REDIS_PASSWORD=null
 REDIS_PORT=6379
 
+# Local/CI: log or array. Production transactional email: MAIL_MAILER=resend
 MAIL_MAILER=log
 MAIL_SCHEME=null
 MAIL_HOST=127.0.0.1
@@ -62,10 +63,22 @@ MAIL_PASSWORD=null
 MAIL_FROM_ADDRESS="hello@example.com"
 MAIL_FROM_NAME="${APP_NAME}"
 
+# Required when MAIL_MAILER=resend
+RESEND_API_KEY=
+
 AWS_ACCESS_KEY_ID=
 AWS_SECRET_ACCESS_KEY=
 AWS_DEFAULT_REGION=us-east-1
 AWS_BUCKET=
 AWS_USE_PATH_STYLE_ENDPOINT=false
 
+# Cloudflare R2 (production object storage). Set FILESYSTEM_DISK=r2 in production.
+# R2_URL must be the custom domain mapped to the bucket (e.g. https://media.example.com).
+# R2_ENDPOINT example: https://<account_id>.r2.cloudflarestorage.com
+R2_ACCESS_KEY_ID=
+R2_SECRET_ACCESS_KEY=
+R2_BUCKET=
+R2_ENDPOINT=
+R2_URL=
+
 VITE_APP_NAME="${APP_NAME}"