Adauga README.md: arhitectura, configurare, rulare locala si cu start.sh,
testare in browser (dashboard, Swagger, import xlsx/csv), proba trimitere la
RAR test + verificare, formate de fisier per cont (signature_coloane), conturi
si chei API (CLI tools.apikey, exemple curl cu X-API-Key) si starea reala a
auth-ului (POST/import protejate; GET-uri de listare inca globale).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
