Make onboarding tour install-wide instead of per-browser

Persist onboardingCompleted flag server-side via /api/v1/config so the
tour only auto-starts once per DashCaddy installation, not on every
new browser that connects.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

status/js/progress-tracker.js

@@ -29,6 +29,7 @@
     constructor(storageKey = 'dashcaddy_onboarding') {
       this.storageKey = storageKey;
       this.storageVersion = '1.0';
+      this.installOnboardingCompleted = typeof SITE !== 'undefined' && SITE.onboardingCompleted === true;
       
       // Initialize storage if it doesn't exist
       this._initializeStorage();
@@ -159,6 +160,36 @@
       return state.tourCompleted === true;
     }
 
+    /**
+     * Check if onboarding has already been consumed for this install.
+     * @returns {boolean} True if auto-onboarding should stay suppressed
+     */
+    isInstallOnboardingCompleted() {
+      return this.installOnboardingCompleted === true;
+    }
+
+    /**
+     * Persist install-wide onboarding completion so it only auto-starts once.
+     * Manual Help Tour restarts are still allowed via local state reset.
+     * @returns {Promise<void>}
+     */
+    async markInstallOnboardingCompleted() {
+      if (this.installOnboardingCompleted) return;
+
+      this.installOnboardingCompleted = true;
+      if (typeof SITE !== 'undefined') SITE.onboardingCompleted = true;
+
+      try {
+        await secureFetch('/api/v1/config', {
+          method: 'POST',
+          headers: { 'Content-Type': 'application/json' },
+          body: JSON.stringify({ onboardingCompleted: true })
+        });
+      } catch (error) {
+        console.error('[ProgressTracker] Failed to persist install onboarding state:', error);
+      }
+    }
+
     /**
      * Mark the entire tour as completed
      */