* feat: add build validation for SINGLE_ORG_SLUG and auto-enable organizations - Add build-time validation to prevent SINGLE_ORG_SLUG from conflicting with RESERVED_SUBDOMAINS - Auto-enable ORGANIZATIONS_ENABLED when SINGLE_ORG_SLUG is set - Validation throws clear error message with list of reserved subdomains - Follows existing environment validation patterns in next.config.js Co-Authored-By: hariom@cal.com <hariombalhara@gmail.com> * refactor: change SINGLE_ORG_SLUG validation from error to warning - Replace build-crashing error with clear warning message - Ignore RESERVED_SUBDOMAINS when SINGLE_ORG_SLUG is set since they don't make sense together - Keep auto-enabling ORGANIZATIONS_ENABLED functionality - Build continues successfully instead of failing Co-Authored-By: hariom@cal.com <hariombalhara@gmail.com> * Update next.config.js * Update next.config.js --------- Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>