fix(studio): support BytePlus self-update

[evanlowe]

Summary

• propagate the active cloud provider through Studio self-update, status, and log calls
• preserve BytePlus runtime environment, dependencies, entrypoint, branding, and console links during frontend-triggered updates
• reconcile resources introduced after initial deployment before uploading the new Function bundle
• reuse existing resources, create missing private TOS storage and three snapshot-enabled Sandbox Tools, bind their model credentials, and merge the resulting environment overrides with the complete current Function environment
• expose the resource-provisioning phase in the frontend update progress and diagnostics

Cloud verification

• deployed the branch to an isolated BytePlus Studio using the existing User Pool
• confirmed the pre-update Function lacked the TOS and snapshot Sandbox environment variables
• published an isolated release and triggered the update from the Studio frontend
• observed the provisioning phase complete in about 17 seconds and the complete update finish in about 2 minutes
• confirmed the Application returned to deploy_success and the target release revision took over
• confirmed the new TOS bucket and all three snapshot Sandbox Tools were present; each Tool was Ready, snapshot-enabled, and had its model credential environment
• confirmed the existing Dev and chat Tool IDs, User Pool IDs, OAuth client ID, provider settings, and update source remained unchanged

Verification

• uv run pytest -q (1379 passed, 6 skipped, 6 subtests passed)
• npm test --prefix frontend (462 passed)
• npm run build --prefix frontend
• uv run pre-commit run --all-files
• targeted Pyright check (0 errors)