#11272: Update render.yaml

for free version <!-- greptile_comment --> <h2>Greptile Overview</h2> <h3>Greptile Summary</h3> This PR adjusts the Render deployment configuration by switching the `openclaw` web service plan from `starter` to `free` and removing the persistent `disk` mount at `/data`. Because the service’s env vars still configure `OPENCLAW_STATE_DIR` and `OPENCLAW_WORKSPACE_DIR` under `/data`, removing the disk changes the runtime storage semantics: state/workspace will no longer be durable and may break if `/data` isn’t available or writable on the free plan. <h3>Confidence Score: 3/5</h3> - This PR is not safe to merge as-is if the app relies on durable state/workspace under /data. - The only functional change is removing the persistent disk while keeping state/workspace directories on `/data`, which can cause runtime failures and guaranteed data loss across restarts if Render free plan provides only ephemeral storage (or doesn’t create `/data`). Fix is straightforward but needs to be resolved before merge. - render.yaml <!-- greptile_other_comments_section --> _{(2/5) Greptile learns from your feedback when you react with thumbs up/down!} <!-- /greptile_comment -->