feat: add disk-safety warning step to setup wizard + health retention setting

- Add dedicated 'Disk Usage Note' step to setup wizard, shown after the
  configuration summary. Warns that health history, container stats, and
  event logs accumulate and links to Settings -> Health for retention limits.
- Repoint the finish button to the new step (summary now has 'Continue ->').
- Remove the now-redundant inline disk tip from the JS-rendered summary.
- Add 'Max Entries Per Service' (default 500) setting to the Health -> Configure
  -> Global Settings panel alongside the existing retention-days setting.

status/js/setup-wizard.js

@@ -135,22 +135,6 @@ window.populateTimezoneSelect = function(selectEl, selectedTz) {
       </div>
     `;
 
-    // Disk-safety reminder (universal across all config types)
-    html += `
-      <div style="margin-top: 12px; padding: 12px 14px; border-radius: 8px; border: 1px solid var(--warn-fg, #f39c12); background: color-mix(in srgb, var(--warn-fg, #f39c12) 8%, transparent);">
-        <div style="display: flex; gap: 8px; align-items: flex-start;">
-          <span style="font-size: 1.1rem;">💾</span>
-          <div style="font-size: 0.85rem; line-height: 1.45;">
-            <strong style="color: var(--warn-fg, #f39c12);">Disk-space tip:</strong>
-            Health-check monitoring records uptime, response-time, and incident data continuously.
-            By default DashCaddy keeps <strong>30 days</strong> of history and warns at <strong>80% disk usage</strong>.
-            You can tune the retention period, polling interval, and disk threshold later under
-            <strong>Health → Configure → Global Settings</strong>.
-          </div>
-        </div>
-      </div>
-    `;
-
     html += '</div>';
     summaryContent.innerHTML = html;
     showStep('setup-step-summary');
@@ -393,8 +377,26 @@ window.populateTimezoneSelect = function(selectEl, selectedTz) {
     };
   }
 
-  // Finish setup button
-  const finishBtn = document.getElementById('setup-finish');
+  // Summary "Continue →" — advance to the disk-safety warning step
+  const summaryNext = document.getElementById('setup-summary-next');
+  if (summaryNext) {
+    summaryNext.onclick = function(e) {
+      e.preventDefault();
+      showStep('setup-step-disk-safety');
+    };
+  }
+
+  // Disk-safety step navigation
+  const diskSafetyBack = document.getElementById('setup-disk-safety-back');
+  if (diskSafetyBack) {
+    diskSafetyBack.onclick = function(e) {
+      e.preventDefault();
+      showStep('setup-step-summary');
+    };
+  }
+
+  // Finish setup button (now on the disk-safety step)
+  const finishBtn = document.getElementById('setup-disk-safety-finish');
   if (finishBtn) {
     finishBtn.onclick = function(e) {
       e.preventDefault();