refactor: flatten pages structure and update setup.php for Git Sync

- Move pages/{fqdn}/pages/* to pages/{fqdn}/*
- Update setup.php to look at /user/pages/{hostname}
- Prepare for Git Sync to sync pages/ to user/pages/

pages/plan.knownelement.com/07.inventory-template/default.md

@@ -0,0 +1,20 @@
+---
+title: 'KNEL — Inventory Template (STEP0)'
+menu: 'KNEL — Inventory Template (STEP0)'
+---
+
+# KNEL — Inventory Template (STEP0)
+
+CSV headers (example)
+
+```
+app_id,app_name,biz,env,slo,cost_center,url,notes
+12345,gitea,merchants-of-hope,prod,tier-2,KNEL:GIT-ORG,https://gitea.example.com/org/...,primary code hosting
+12346,matomo,your-dream-name-here,prod,tier-2,KNEL:MAT-PROP,https://matomo.example.com/#idSite=...,analytics
+12347,documenso,sol-calc,prod,tier-2,KNEL:DOC-SEAT,https://sign.example.com,contracts
+12348,redmine,rackrental,prod,tier-3,KNEL:RED-PROJ,https://pm.example.com,project tracking
+```
+
+Notes
+- Export nightly (CSV/JSON) from Cloudron inventory or maintain manually to start.
+- Tags: `biz`, `env`, `slo`, `cost_center` support lightweight reconciliation to Dolibarr.