feat: Token-Nutzung Tab sichtbar + Budget-Bearbeitung

- display:none entfernt, .active-Klasse greift jetzt korrekt
- Budget-Formular mit 4 Feldern (Credits, Kosten/Credit, Budget-Limit, Verbrauch)
- Formular wird mit aktuellen Werten vorbelegt
- Speichern aktualisiert Lizenz und lädt Daten neu

src/static/dashboard.html

@@ -163,7 +163,7 @@
             </div>
           </div>
 
-        <div class="section" id="sub-tokens" style="display:none;">
+        <div class="section" id="sub-tokens">
           <div class="token-overview">
             <div class="token-stats-row" id="tokenStatsRow">
               <div class="token-stat-card">
@@ -206,6 +206,34 @@
               </thead>
               <tbody id="tokenMonthlyTable"></tbody>
             </table>
+
+            <h3 style="margin-top:24px;">Budget bearbeiten</h3>
+            <div class="card" style="margin-top:12px;">
+              <div class="card-body">
+                <form id="tokenBudgetForm" style="display:grid; grid-template-columns:1fr 1fr; gap:12px;">
+                  <div class="form-group">
+                    <label for="editCreditsTotal">Credits-Kontingent</label>
+                    <input type="number" id="editCreditsTotal" placeholder="z.B. 600000">
+                  </div>
+                  <div class="form-group">
+                    <label for="editCostPerCredit">Kosten pro Credit (USD)</label>
+                    <input type="number" id="editCostPerCredit" step="0.0001" placeholder="z.B. 0.0033">
+                  </div>
+                  <div class="form-group">
+                    <label for="editBudgetUsd">Budget-Limit (USD)</label>
+                    <input type="number" id="editBudgetUsd" step="0.01" placeholder="z.B. 2000">
+                  </div>
+                  <div class="form-group">
+                    <label for="editCreditsUsed">Verbrauchte Credits</label>
+                    <input type="number" id="editCreditsUsed" step="0.01" placeholder="Aktueller Verbrauch">
+                  </div>
+                  <div style="grid-column:1/-1; display:flex; gap:8px; align-items:center;">
+                    <button type="submit" class="btn btn-primary">Speichern</button>
+                    <span id="tokenBudgetMsg" style="font-size:13px; color:var(--text-secondary);"></span>
+                  </div>
+                </form>
+              </div>
+            </div>
           </div>
         </div>
         </div>