Phase 18 (Verwaltung): fetch_strategy in CRUD + Edit-Modal

- migrations/2026-05-09e_fetch_strategy.py NEU: ALTER TABLE sources ADD COLUMN
  fetch_strategy. Pre-flagging fuer FT/WSJ/NZZ etc. (paywall) und Rheinische
  Post/Verfassungsschutz (googlebot).
- shared/services/source_health.py: gesynct vom Monitor (Phase-18-Code mit
  Retry-Logik + Strategien default/googlebot/paywall/skip).
- routers/sources.py: GlobalSourceCreate/Update um fetch_strategy
  (Pattern-Validation), SOURCE_UPDATE_COLUMNS + INSERT erweitert.
- dashboard.html: Edit-Modal hat jetzt Dropdown sourceFetchStrategy.
- sources.js: laedt + sendet fetch_strategy mit.

Cache-Buster 20260509c -> 20260509d.

src/static/dashboard.html

@@ -6,7 +6,7 @@
   <title>AegisSight Monitor-Verwaltung</title>
   <link rel="icon" type="image/svg+xml" href="/static/favicon.svg">
   <link rel="apple-touch-icon" href="/static/favicon.svg">
-  <link rel="stylesheet" href="/static/css/style.css?v=20260509c">
+  <link rel="stylesheet" href="/static/css/style.css?v=20260509d">
 
     <style>
       .source-badge { display:inline-block; padding:2px 8px; border-radius:4px; font-size:12px; font-weight:600; }
@@ -625,6 +625,15 @@
             <label for="sourceBias">Bias / Einordnung</label>
             <input type="text" id="sourceBias" placeholder="z.B. Nachrichtenagentur, faktenbasiert-neutral" maxlength="500">
           </div>
+          <div class="form-group">
+            <label for="sourceFetchStrategy">Fetch-Strategie (Health-Check)</label>
+            <select id="sourceFetchStrategy">
+              <option value="default">Standard (UA + Retry mit Googlebot bei 403)</option>
+              <option value="googlebot">Googlebot (direkt - fuer SEO-freundliche Sites)</option>
+              <option value="paywall">Paywall (via removepaywalls.com - z.B. FT, Spiegel+)</option>
+              <option value="skip">Skip (Health-Check ueberspringen)</option>
+            </select>
+          </div>
           <div class="form-group">
             <label for="sourceNotes">Notizen</label>
             <input type="text" id="sourceNotes" placeholder="Optional">
@@ -697,10 +706,10 @@
     </div>
   </div>
 
-  <script src="/static/js/app.js?v=20260509c"></script>
-  <script src="/static/js/sources.js?v=20260509c"></script>
-  <script src="/static/js/source-health.js?v=20260509c"></script>
-  <script src="/static/js/audit.js?v=20260509c"></script>
+  <script src="/static/js/app.js?v=20260509d"></script>
+  <script src="/static/js/sources.js?v=20260509d"></script>
+  <script src="/static/js/source-health.js?v=20260509d"></script>
+  <script src="/static/js/audit.js?v=20260509d"></script>
   <div id="toastContainer" class="toast-container" aria-live="polite" aria-atomic="true"></div>
 </body>
 </html>