feat(clienti): add Oracle XE PDB recreare scripts and audit cleanup

- Complete PDB export/import workflow (16 scripts in clienti/oracle-xe-21c/import/)
- Recreare PDB script with step-by-step guide (recreare_pdb.sql)
- Universal audit cleanup script for Oracle XE 11g-21c (cleanup_audit.sql)
- Troubleshooting guide with all lessons learned (depanare-ora-12954-spatiu.md)
- Fixed: DIRECTORY grant syntax, DBMS_LOCK grant, remap_tablespace USERS:ROA,
  impdp quoted AS SYSDBA for Windows, AWR retention 8 days, datafile full path
- Updated roa-windows-setup docs with XE prevention steps and gotchas table

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

proxmox/lxc108-oracle/roa-windows-setup/README.md

@@ -396,10 +396,32 @@ ALTER PLUGGABLE DATABASE XEPDB1 SAVE STATE;
 impdp ... REMAP_TABLESPACE=ROA:USERS
 ```
 
+**ORA-00959: tablespace 'USERS' does not exist (pe PDB nou):**
+```cmd
+REM PDB-ul nou din PDB$SEED nu are tablespace USERS. Remapeaza la ROA:
+impdp "sys/pass@XEPDB1 AS SYSDBA" ... remap_tablespace=USERS:ROA
+```
+
 **ORA-39405: Oracle Data Pump does not support importing from a source database with TSTZ version newer:**
 
 Use DMP files exported from Oracle 18c (TSTZ 31) instead of Oracle 21c (TSTZ 35).
 
+### ORA-12954: Database exceeds 12 GB (XE only)
+
+See `clienti/oracle-xe-21c/depanare-ora-12954-spatiu.md` for full troubleshooting guide.
+
+**Prevention (run on every new XE installation):**
+```sql
+-- Connect to XEPDB1 as SYS
+EXEC DBMS_AUTO_TASK_ADMIN.DISABLE(client_name => 'sql tuning advisor', operation => NULL, window_name => NULL);
+EXEC DBMS_AUTO_TASK_ADMIN.DISABLE(client_name => 'auto space advisor', operation => NULL, window_name => NULL);
+NOAUDIT POLICY ORA_SECURECONFIG;
+NOAUDIT POLICY ORA_LOGON_FAILURES;
+EXEC DBMS_WORKLOAD_REPOSITORY.MODIFY_SNAPSHOT_SETTINGS(retention => 8*24*60, interval => 60);
+EXEC DBMS_STATS.ALTER_STATS_HISTORY_RETENTION(7);
+GRANT EXECUTE ON SYS.DBMS_LOCK TO CONTAFIN_ORACLE;
+```
+
 ### Service Not Starting
 
 Check Windows Services: