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>

clienti/oracle-xe-21c/import/06_sys_views.sql

@@ -0,0 +1,15 @@
+-- 06_sys_views.sql
+-- Create SYS custom views
+-- Source: backup/07_sys_views.sql
+
+CREATE OR REPLACE FORCE VIEW "SYS"."VAUTH_SERII" ("ID_PROGRAM", "NUME", "SERIE", "NR_UTIL", "DATA_VAL") AS
+select a.id_program,
+     a.denumire as nume,
+     auth_pack.selecteaza_serie(a.id_program) as serie,
+     auth_pack.selecteaza_nr_util(a.id_program) as nr_util,
+     auth_pack.selecteaza_data_val(a.id_program) as data_val
+from syn_nom_programe a
+left join syn_def_programe b on a.id_program = b.ide_program
+where b.sters = 0
+  and b.instalat = 1;
+/