refactor(swap): rename imported .md files to md- prefix for swap mechanism

Restore the canary file naming convention that swap_sources.py expects:
the imported MyST pages now live as docs/<dir>/md-<name>.md alongside
the existing docs/<dir>/<name>.rst, so swap_sources.py --swap can rename
them into place at build time.

- 254 .md files renamed (every page with a matching .rst counterpart)
- 2 MyST-only pages left at their final names (no .rst exists, no swap
  needed): docs/copyright.md, docs/automation/terraform/terraformvyos.md

All 114 stems listed in docs/_swap.txt now have a corresponding
md-<name>.md source file ready to swap in.

🤖 Generated by [robots](https://vyos.io)

5 files changed, 0 insertions, 0 deletions

diff --git a/docs/installation/cloud/aws.md b/docs/installation/cloud/md-aws.md
index de5da3aa..de5da3aa 100644
--- a/docs/installation/cloud/aws.md
+++ b/docs/installation/cloud/md-aws.md
diff --git a/docs/installation/cloud/azure.md b/docs/installation/cloud/md-azure.md
index 24b7b166..24b7b166 100644
--- a/docs/installation/cloud/azure.md
+++ b/docs/installation/cloud/md-azure.md
diff --git a/docs/installation/cloud/gcp.md b/docs/installation/cloud/md-gcp.md
index 828312cd..828312cd 100644
--- a/docs/installation/cloud/gcp.md
+++ b/docs/installation/cloud/md-gcp.md
diff --git a/docs/installation/cloud/index.md b/docs/installation/cloud/md-index.md
index cf7d447d..cf7d447d 100644
--- a/docs/installation/cloud/index.md
+++ b/docs/installation/cloud/md-index.md
diff --git a/docs/installation/cloud/oracle.md b/docs/installation/cloud/md-oracle.md
index f8cee52c..f8cee52c 100644
--- a/docs/installation/cloud/oracle.md
+++ b/docs/installation/cloud/md-oracle.md