feat: Slot-basierter Auto-Refresh mit konfigurierbarer Startzeit

Auto-Refresh nutzt jetzt eine feste Anker-Uhrzeit (refresh_start_time) statt
reinem Intervall-basiertem Driften. Verpasste Slots werden max. 1x aufgeholt.
Bestehendes Intervall-Verhalten bleibt als Fallback erhalten (ohne Startzeit).

Migration: Bestehende Auto-Lagen erhalten 07:00 als Startzeit.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/static/dashboard.html

@@ -398,6 +398,10 @@
                             </select>
                         </div>
                     </div>
+                    <div class="form-group conditional-field" id="refresh-starttime-field">
+                        <label for="inc-refresh-starttime">Erste Aktualisierung um <span class="info-icon tooltip-below" data-tooltip="Legt den Startzeitpunkt fest. Danach wird im eingestellten Intervall aktualisiert."><svg xmlns="http://www.w3.org/2000/svg" width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><circle cx="12" cy="12" r="10"/><path d="M12 16v-4"/><path d="M12 8h.01"/></svg></span></label>
+                        <input type="time" id="inc-refresh-starttime" value="07:00" required>
+                    </div>
                     <div class="form-group">
                         <label for="inc-retention">Aufbewahrung (Tage) <span class="info-icon tooltip-below" data-tooltip="Nach Ablauf wird die Lage automatisch archiviert. 0 = unbegrenzt aufbewahren."><svg xmlns="http://www.w3.org/2000/svg" width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><circle cx="12" cy="12" r="10"/><path d="M12 16v-4"/><path d="M12 8h.01"/></svg></span></label>
                         <input type="number" id="inc-retention" min="0" max="999" value="30" placeholder="0 = Unbegrenzt">

src/static/js/app.js

@@ -821,9 +821,16 @@ const App = {
                 : '';
         }
 
-        { const _e = document.getElementById('meta-refresh-mode'); if (_e) _e.textContent = incident.refresh_mode === 'auto'
-            ? `Auto alle ${App._formatInterval(incident.refresh_interval)}`
-            : 'Manuell'; }
+        { const _e = document.getElementById('meta-refresh-mode'); if (_e) {
+            if (incident.refresh_mode === 'auto' && incident.refresh_start_time) {
+                const intervalText = App._formatInterval(incident.refresh_interval);
+                _e.textContent = `Auto alle ${intervalText} ab ${incident.refresh_start_time} Uhr`;
+            } else if (incident.refresh_mode === 'auto') {
+                _e.textContent = `Auto alle ${App._formatInterval(incident.refresh_interval)}`;
+            } else {
+                _e.textContent = 'Manuell';
+            }
+        } }
 
         // International-Badge
         const intlBadge = document.getElementById('intl-badge');
@@ -1517,6 +1524,9 @@ const App = {
             type: document.getElementById('inc-type').value,
             refresh_mode: document.getElementById('inc-refresh-mode').value,
             refresh_interval: interval,
+            refresh_start_time: document.getElementById('inc-refresh-mode').value === 'auto'
+                ? document.getElementById('inc-refresh-starttime').value || null
+                : null,
             retention_days: parseInt(document.getElementById('inc-retention').value) || 0,
             international_sources: document.getElementById('inc-international').checked,
             include_telegram: document.getElementById('inc-telegram').checked,
@@ -1914,6 +1924,7 @@ async handleRefresh() {
         { const _e = document.getElementById('inc-type'); if (_e) _e.value = incident.type || 'adhoc'; }
         { const _e = document.getElementById('inc-refresh-mode'); if (_e) _e.value = incident.refresh_mode; }
         App._setIntervalFields(incident.refresh_interval);
+        { const _e = document.getElementById('inc-refresh-starttime'); if (_e) _e.value = incident.refresh_start_time || '07:00'; }
         { const _e = document.getElementById('inc-retention'); if (_e) _e.value = incident.retention_days; }
         { const _e = document.getElementById('inc-international'); if (_e) _e.checked = incident.international_sources !== false && incident.international_sources !== 0; }
         { const _e = document.getElementById('inc-telegram'); if (_e) _e.checked = !!incident.include_telegram; }
@@ -3214,7 +3225,9 @@ function buildDetailedSourceOverview() {
 function toggleRefreshInterval() {
     const mode = document.getElementById('inc-refresh-mode').value;
     const field = document.getElementById('refresh-interval-field');
+    const startField = document.getElementById('refresh-starttime-field');
     field.classList.toggle('visible', mode === 'auto');
+    if (startField) startField.classList.toggle('visible', mode === 'auto');
 }
 
 function updateIntervalMin() {