OTF Complete Mattermost Tech Asset

## Checklist - [ ] Add Railway region - [ ] Add CPU plan limit - [ ] Add RAM plan limit - [ ] Confirm custom domain URL (comms.optimifed.com) - [ ] Add Mattermost version - [ ] Add cost/billing info (Railway usage) - [ ] Add SMTP/email config details - [ ] Add Sentry integration details (if applicable — logs show sentry-go) - [ ] Confirm Cloudflare SSL mode (Full Strict) - [ ] Confirm Cloudflare proxy status - [ ] Add MM_SERVICESETTINGS_SITEURL env var value - [ ] Document shared Postgres connection string pattern - [ ] Add Umami subdomain to tech asset once confirmed ## Related - Tech asset: [[otf-mattermost]]