docs: regenerate terraform-docs with shared config

[posquit0]

Summary

Regenerate module documentation with terraform-docs using the shared .terraform-docs.yml (lockfile: false, sort.by: required), so that README.md matches the output checked by the Terraform integration CI.

Changes

• Providers table now shows the version constraint from required_providers instead of the exact version from a local .terraform.lock.hcl.
• Markdown table separators normalized to terraform-docs v0.24.0 output.
• Inputs, outputs, and module entries that had drifted from the current code are refreshed where applicable.

Generated with pre-commit run terraform_docs --all-files (terraform-docs v0.24.0). Only README.md files are touched.