fix: use Firebird PREFIJO as codigoPrefijo; add debug endpoint to find CUPs field

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

main.py

@@ -65,7 +65,7 @@ async def root():
     return RedirectResponse(url="/dashboard")
 
 
-from app.routes import auth, dashboard, config, queries, terceros, transaccion, logs, automation, test_rda
+from app.routes import auth, dashboard, config, queries, terceros, transaccion, logs, automation, test_rda, debug_fb
 
 app.include_router(auth.router)
 app.include_router(dashboard.router)
@@ -76,6 +76,7 @@ app.include_router(transaccion.router)
 app.include_router(logs.router)
 app.include_router(automation.router)
 app.include_router(test_rda.router)
+app.include_router(debug_fb.router)
 
 
 if __name__ == "__main__":