Add backup recovery center

serato_doctor/webui/recovery.css

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+.recovery-panel{margin-top:18px;padding:25px}.recovery-panel>p{color:var(--muted);font-size:12px;line-height:1.6}.recovery-panel .section-heading button{border:1px solid rgba(155,135,245,.35);border-radius:10px;padding:9px 12px;background:rgba(155,135,245,.12);color:#ddd8fa;font:700 11px inherit;cursor:pointer}.recovery-panel button:disabled{opacity:.5;cursor:not-allowed}.backup-summary{padding:11px 13px;border-radius:11px;background:rgba(255,255,255,.03);color:#bfc4cf;font-size:11px;margin:15px 0 10px}.backup-list{display:grid;gap:9px}.backup-item{display:flex;align-items:center;justify-content:space-between;gap:18px;padding:14px;border:1px solid var(--line);border-radius:13px;background:rgba(255,255,255,.025)}.backup-item>div{min-width:0}.backup-item strong,.backup-item small{display:block}.backup-item strong{font-size:12px;margin:7px 0}.backup-item small{font-size:10px;color:var(--muted);line-height:1.5;overflow-wrap:anywhere}.backup-item>button{flex:0 0 auto;border:0;border-radius:10px;padding:10px 13px;background:#6f5bd0;color:#fff;font:700 11px inherit;cursor:pointer}.backup-status{display:inline-block;padding:4px 7px;border-radius:999px;font-size:9px;text-transform:uppercase;letter-spacing:.08em;color:var(--cyan);background:rgba(102,217,232,.1)}.backup-status.restored{color:#aeb4c2;background:rgba(255,255,255,.06)}@media(max-width:520px){.backup-item{align-items:stretch;flex-direction:column}.backup-item>button{width:100%}}