Pass PG_VERSION from the Mealie installer (replace POSTGRES_VERSION with PG_VERSION) and update misc/tools.func to prefer vendor package repos by default. Adjusted comments/examples for setup_mysql and setup_postgresql to reflect the new default behavior, and changed the local default for USE_MYSQL_REPO to true. These changes align variable naming in the installer and clarify that official MySQL/PGDG repositories are used unless explicitly disabled.
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