feat(bot): add /dashboard command and MINI_APP_URL config

- Add /dashboard command to BotFather registration alongside /app
- Add new MINI_APP_URL env var for dashboard URL (separate from CORS origins)
- Pass MINI_APP_URL and BOT_API_URL in CD workflow
- Update Terraform with new variable for future infrastructure deployments

infra/terraform/main.tf

@@ -166,6 +166,9 @@ module "bot_api_service" {
     length(var.bot_mini_app_allowed_origins) == 0 ? {} : {
       MINI_APP_ALLOWED_ORIGINS = join(",", var.bot_mini_app_allowed_origins)
     },
+    var.bot_mini_app_url == null ? {} : {
+      MINI_APP_URL = var.bot_mini_app_url
+    },
     {
       SCHEDULER_OIDC_ALLOWED_EMAILS = google_service_account.scheduler_invoker.email
     }