Persistenza dati e logging avanzato con UI e Unraid

- Aggiunto TradeHistoryService per persistenza trade/posizioni attive su disco (JSON, auto-save/restore)
- Logging centralizzato (LoggingService) con livelli, categorie, simbolo e buffer circolare (500 log)
- Nuova pagina Logs: monitoraggio real-time, filtri avanzati, cancellazione log, colorazione livelli
- Sezione "Dati Persistenti" in Settings: conteggio trade, dimensione dati, reset con conferma modale
- Background service per salvataggio sicuro su shutdown/stop container
- Aggiornata sidebar, stili modali/bottoni danger, .gitignore e documentazione (README, CHANGELOG, UNRAID_INSTALL, checklist)
- Versione 1.3.0

TradingBot/wwwroot/app.css

@@ -469,6 +469,123 @@ select:focus {
     }
 }
 
+/* Modal Styles */
+.modal-overlay {
+    position: fixed;
+    inset: 0;
+    background: rgba(0, 0, 0, 0.75);
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    z-index: 9999;
+    animation: fadeIn 0.2s ease-out;
+}
+
+.modal-dialog {
+    background: #1a1f3a;
+    border-radius: 0.75rem;
+    width: 90%;
+    max-width: 500px;
+    border: 1px solid rgba(99, 102, 241, 0.2);
+    animation: slideIn 0.3s ease-out;
+    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
+}
+
+.modal-header {
+    padding: 1.5rem;
+    border-bottom: 1px solid rgba(99, 102, 241, 0.1);
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+}
+
+.modal-header h3 {
+    font-size: 1.25rem;
+    font-weight: 700;
+    color: #e2e8f0;
+    margin: 0;
+}
+
+.btn-close {
+    width: 2rem;
+    height: 2rem;
+    border-radius: 0.375rem;
+    background: transparent;
+    border: none;
+    color: #94a3b8;
+    font-size: 1.5rem;
+    cursor: pointer;
+    transition: all 0.2s ease;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+}
+
+.btn-close:hover {
+    background: rgba(239, 68, 68, 0.1);
+    color: #ef4444;
+}
+
+.modal-body {
+    padding: 1.5rem;
+}
+
+.modal-body p {
+    margin-bottom: 1rem;
+    line-height: 1.6;
+}
+
+.modal-body ul {
+    margin: 1rem 0;
+    padding-left: 1.5rem;
+}
+
+.modal-body li {
+    margin: 0.5rem 0;
+    color: #cbd5e1;
+}
+
+.modal-footer {
+    padding: 1.5rem;
+    border-top: 1px solid rgba(99, 102, 241, 0.1);
+    display: flex;
+    gap: 1rem;
+    justify-content: flex-end;
+}
+
+.text-danger {
+    color: #ef4444 !important;
+}
+
+/* Danger Button */
+.btn-danger {
+    display: inline-flex;
+    align-items: center;
+    gap: 0.5rem;
+    padding: 0.75rem 1.5rem;
+    border-radius: 0.5rem;
+    font-size: 0.875rem;
+    font-weight: 600;
+    background: linear-gradient(135deg, #dc2626 0%, #b91c1c 100%);
+    color: white;
+    border: none;
+    cursor: pointer;
+    transition: all 0.3s ease;
+    box-shadow: 0 4px 12px rgba(220, 38, 38, 0.3);
+}
+
+.btn-danger:hover {
+    transform: translateY(-2px);
+    box-shadow: 0 6px 16px rgba(220, 38, 38, 0.4);
+    background: linear-gradient(135deg, #b91c1c 0%, #991b1b 100%);
+}
+
+.btn-danger:disabled {
+    opacity: 0.5;
+    cursor: not-allowed;
+    transform: none;
+}
+
 /* Print Styles */
 @media print {
     .no-print {