docs(clienti): index ROMPETROL ENERGY ORA-12954 PDB recreation case

Add a top-level case index at lxc108-oracle/clienti/README.md and a
narrative README inside oracle-xe-21c/ that names ROMPETROL ENERGY
explicitly, describes symptom -> diagnostic -> what failed -> what
worked, and lists each numbered SQL with its role in the import phases.

Wire the case into discoverable entry points:
- proxmox/lxc108-oracle/README.md: new "clienti/" subsection
- proxmox/README.md: tree + nav links
- /workspace/romfastsql/CLAUDE.md: entry points

Future "Rompetrol Energy" / "ORA-12954" / "recreare PDB" searches now hit
the docs from the master indices instead of via grep on schema name.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

CLAUDE.md

@@ -45,6 +45,8 @@ input/                      # Oracle DMP files for import
 - **Disaster recovery**: `proxmox/vm109-windows-dr/README.md`
 - **ROA Windows setup scripts (XE/SE 21c)**: `proxmox/lxc108-oracle/roa-windows-setup/README.md`
 - **VM 302 test environment for ROA setup**: `proxmox/vm302-oracle-test/README.md`
+- **Cazuri clienți (depanare DB)**: `proxmox/lxc108-oracle/clienti/README.md`
+  - **ROMPETROL ENERGY — recreare PDB Oracle XE 21c după ORA-12954**: `proxmox/lxc108-oracle/clienti/oracle-xe-21c/README.md`
 
 ## Infrastructure Commands