Change ROA settings defaults to NULL and remove obsolete script

Changes:
1. Update settings.ini.example with [ROA] section using NULL defaults
2. Modify ApplicationSetup.prg to handle NULL values properly:
   - CreateDefaultIni writes "NULL" string to INI file
   - LoadSettings converts "NULL" string to VFP .NULL. value
3. Update Oracle package defaults from (0, 1, 2) to (NULL, NULL, NULL):
   - p_id_pol DEFAULT NULL
   - p_id_gestiune DEFAULT NULL
   - p_id_sectie DEFAULT NULL
4. Remove obsolete 02_import_parteneri.sql (replaced by 05_pack_import_parteneri.pck)
5. Update local settings.ini with NULL values

Rationale:
- NULL is semantically correct (no policy/gestiune/sectie specified)
- Previous defaults (0, 1, 2) were invalid IDs in ROA system
- Maintains backward compatibility through Oracle DEFAULT NULL

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

vfp/settings.ini.example

@@ -26,6 +26,11 @@ AdapterProgram=gomag-adapter.prg
 JsonFilePattern=gomag_orders*.json
 AutoRunAdapter=1
 
+[ROA]
+IdPol=NULL
+IdGestiune=NULL
+IdSectie=NULL
+
 # ===============================================
 # CONFIGURATIE SYNC COMENZI WEB → ORACLE ROA
 # ===============================================
@@ -48,6 +53,11 @@ AutoRunAdapter=1
 # - JsonFilePattern: Pattern pentru fisiere JSON (ex: gomag_orders*.json)
 # - AutoRunAdapter: 1=ruleaza automat adapter, 0=foloseste doar JSON existent
 #
+# [ROA] - Configurari sistem ROA
+# - IdPol: ID politica de preturi (NULL=fara politica, numar=ID specific)
+# - IdGestiune: ID gestiune pentru comenzi (NULL=automat, numar=ID specific)
+# - IdSectie: ID sectie pentru comenzi (NULL=automat, numar=ID specific)
+#
 # Pentru utilizare:
 # 1. Copiaza settings.ini.example → settings.ini
 # 2. Configureaza ApiKey si ApiShop pentru GoMag