Fixes #2
### Summary of Changes
- Added operational scope labels to deployment runbooks for DDC, HuaHin, Kittisak, and the new project deployment guide.
- Preserved exact hostnames, ports, PM2 service names, paths, and incident facts as required by DOCUMENTATION_MIGRATION.md.
- Added cross-references to docs/PLATFORM_OVERVIEW.md.
- Updated docs/DOCUMENTATION_MIGRATION.md completion ledger.
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Fixes #2
Summary of Changes