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>

proxmox/lxc108-oracle/README.md

@@ -841,6 +841,17 @@ SQL> SELECT username FROM dba_users;  -- arată userii din ROA
 
 ## 📂 Subdirectoare
 
+### clienti/
+Cazuri concrete de depanare / migrare bază de date la clienți, cu scripturi
+reutilizabile generate din fiecare incident.
+
+| Caz | Director | Scop |
+|-----|----------|------|
+| **ROMPETROL ENERGY** (schemă `ROMPETROLE`) | `clienti/oracle-xe-21c/` | Recreare PDB Oracle XE 21c după ORA-12954 (12 GB depășiți) — diagnostic SYSAUX, drop+recreate PDB din `PDB$SEED`, reimport scheme |
+
+**Documentație:** [`clienti/README.md`](clienti/README.md) (index general)
+și [`clienti/oracle-xe-21c/README.md`](clienti/oracle-xe-21c/README.md) (cazul ROMPETROL).
+
 ### migration/
 Scripturi pentru migrarea Oracle 10g → 21c XE:
 - `00-MASTER-MIGRATION.sh` - Script master orchestrare migrare