docs: modernize platform capability and architecture guides to DBK Platform

docs/DOCUMENTATION_MIGRATION.md

@@ -13,6 +13,15 @@ See [Platform Overview](PLATFORM_OVERVIEW.md) for terminology.
 - `PROJECT_SYSTEM_SUMMARY.md`
 - `PROJECT_MANAGEMENT_PERSPECTIVE.md`
 - `LLM_MCP_GUIDE.md`
+- `ARCHITECTURE_DECISIONS.md`
+- `CUSTOM_BLOCK_FLOW_GUIDE.md`
+- `ADMIN_MCP_SECTION_GUIDE.md`
+- `PRISMA7_GUIDE.md`
+- `mcp_update.md`
+- `implementation_plan.md`
+- `frontend-comparison.md`
+- `BUSINESS_ANALYTICS_MAPS_PLAN.md`
+- `goal.section.md`
 
 These documents now introduce DBK Platform before mentioning HomAroma and explain
 the platform/tenant boundary.