feat: Add universal victory celebration modal, chamber item requirements, and fix broom & cauldron displays

app/templates/base.html

@@ -39,7 +39,7 @@
         {% block content %}{% endblock %}
     </main>
 
-    <!-- Global Modal Backdrop -->
+    <!-- Global Standard Modal Backdrop -->
     <div id="modalBackdrop" class="modal-backdrop">
         <div class="modal-content">
             <div id="modalIcon" class="modal-icon">🏆</div>
@@ -49,6 +49,46 @@
         </div>
     </div>
 
+    <!-- Spectacular Victory Celebration Overlay -->
+    <div id="victoryCelebrationModal" class="victory-modal-backdrop">
+        <canvas id="victoryConfettiCanvas" class="victory-confetti-canvas"></canvas>
+        <div class="victory-card">
+            <div class="victory-crest-wrap">
+                <div id="vicCrestIcon" class="victory-crest-icon">🏆</div>
+            </div>
+            
+            <div id="vicChamberBadge" class="victory-chamber-badge">Kammer Gemeistert</div>
+            <h2 id="vicTitle" class="victory-title">Hervorragend, Zauberschüler!</h2>
+            
+            <div id="vicStatsBox" class="victory-stats-box">
+                <!-- Filled dynamically: Score, Time, Spells -->
+            </div>
+
+            <div id="vicItemRewardBox" class="victory-reward-box" style="display: none;">
+                <div id="vicRewardIcon" class="reward-icon">🗝️</div>
+                <div class="reward-content">
+                    <span class="reward-label">🎒 Neuer Gegenstand im Zauberbeutel:</span>
+                    <strong id="vicRewardName" class="reward-name">Geflügelter Schlüssel</strong>
+                    <p id="vicRewardDesc" class="reward-desc">Öffnet die Eichentür zur Duellier-Kammer.</p>
+                </div>
+            </div>
+
+            <div id="vicStoryBox" class="victory-story-box">
+                <!-- Story progression & hint for next chamber -->
+            </div>
+
+            <div class="victory-actions">
+                <a id="vicNextBtn" href="/duel" class="btn-magical victory-next-btn">
+                    ➔ Weiter zur nächsten Kammer ✨
+                </a>
+                <div class="victory-sub-actions">
+                    <a href="/" class="btn-subtle">🗺️ Kammern-Übersicht</a>
+                    <button type="button" class="btn-subtle" onclick="window.openPlayerDrawer('backpackTab'); document.getElementById('victoryCelebrationModal').classList.remove('show');">🎒 Beutel ansehen</button>
+                </div>
+            </div>
+        </div>
+    </div>
+
     <!-- Slide-Over Player Drawer & Inventory -->
     <div id="drawerBackdrop" class="drawer-backdrop"></div>
     <div id="playerDrawer" class="player-drawer">