Add auto-start targets feature with dashboard section

- Add auto_start boolean field to PictureTarget model (persisted per-target)
- Wire auto_start through API schemas, routes, and store
- Auto-start targets on server boot in main.py lifespan
- Add star toggle button on target cards (next to delete button)
- Add auto-start section on dashboard between performance and profiles
- Remove auto-start section from profiles tab

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

server/src/wled_controller/static/js/features/targets.js

@@ -689,7 +689,10 @@ export function createTargetCard(target, deviceMap, colorStripSourceMap, valueSo
 
     return `
         <div class="card" data-target-id="${target.id}">
-            <button class="card-remove-btn" onclick="deleteTarget('${target.id}')" title="${t('common.delete')}">&#x2715;</button>
+            <div class="card-top-actions">
+                <button class="card-autostart-btn${target.auto_start ? ' active' : ''}" onclick="toggleTargetAutoStart('${target.id}', ${!target.auto_start})" title="${target.auto_start ? t('autostart.toggle.enabled') : t('autostart.toggle.disabled')}">&#x2605;</button>
+                <button class="card-remove-btn" onclick="deleteTarget('${target.id}')" title="${t('common.delete')}">&#x2715;</button>
+            </div>
             <div class="card-header">
                 <div class="card-title">
                     <span class="health-dot ${healthClass}" title="${healthTitle}"></span>
@@ -884,6 +887,25 @@ export async function cloneTarget(targetId) {
     }
 }
 
+export async function toggleTargetAutoStart(targetId, enable) {
+    try {
+        const response = await fetchWithAuth(`/picture-targets/${targetId}`, {
+            method: 'PUT',
+            body: JSON.stringify({ auto_start: enable }),
+        });
+        if (response.ok) {
+            showToast(t(enable ? 'autostart.toggle.enabled' : 'autostart.toggle.disabled'), 'success');
+            loadTargetsTab();
+        } else {
+            const error = await response.json();
+            showToast(`Failed: ${error.detail}`, 'error');
+        }
+    } catch (error) {
+        console.error('Failed to toggle auto-start:', error);
+        showToast('Failed to toggle auto-start', 'error');
+    }
+}
+
 export async function deleteTarget(targetId) {
     const confirmed = await showConfirm(t('targets.delete.confirm'));
     if (!confirmed) return;