chore(docker): upgrade databases to pg18

[Bccorb]

Summary

What

Update the docker services to postgres 18

Why

We are seeking to standardize all systems to postgres 18.

Related Issue

Closes #143 , Closes #243

Changes

• Updates docker services to pg18
• Updates volume mounts to pg18
• removes .keys folder creation in docker

Checklist

• Follows the repo's AGENTS.md and the org REPO-STANDARDS
• Conventional Commit messages; descriptive branch name
• All applicable checks pass: tests, lint, type check, formatting
• No AI or assistant attribution anywhere in commits, PR text, or docs
• No em dashes in public-facing text
• Docs updated if behavior or public contracts changed