Add test-rda page, fix prefijo/remisionante/especialidad for TNS RDA sends

- New /test-rda route: list Firebird candidates with valid contract/factura,
  send individual RDA with auto tercero creation and full result display
- json_generator: use prefijo_tns_default config instead of Firebird PREFIJO,
  add profesionalRemisionante from DOCIDMEDICO or remisionante_default config
- All queries: add DOCIDMEDICO column from MEDICO JOIN
- automation/transaccion: add remisionante_default and prefijo_tns_default params
- config: add remisionante_default (00) and prefijo_tns_default (00) keys
- automation SQL: filter NUM_FACTURA > 0 to skip unbilled records
- config.html: add UI fields for new config keys

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
+from app.routes import auth, dashboard, config, queries, terceros, transaccion, logs, automation, test_rda
 
 app.include_router(auth.router)
 app.include_router(dashboard.router)
@@ -75,6 +75,7 @@ app.include_router(terceros.router)
 app.include_router(transaccion.router)
 app.include_router(logs.router)
 app.include_router(automation.router)
+app.include_router(test_rda.router)
 
 
 if __name__ == "__main__":