feat: make Web UI mood dropdowns Evil Mode-aware

- Disable per-server mood controls when Evil Miku is active
- Show explanatory notice for disabled server mood dropdowns
- Populate global mood dropdown with evil moods when Evil Mode is on
- Fix initialization race condition by awaiting evil mode status first
- Add CSS styles for disabled mood controls

bot/static/css/style.css

@@ -915,3 +915,20 @@ body.evil-mode [style*="color: rgb(0, 123, 255)"] {
   color: #888;
   margin-left: auto;
 }
+
+/* Disabled mood controls (Evil Miku per-server mood lockout) */
+.server-mood-controls select:disabled,
+.server-mood-controls button:disabled {
+  opacity: 0.4;
+  cursor: not-allowed;
+  pointer-events: none;
+  background: #2a2a2a;
+  border-color: #444;
+}
+.evil-mode-exempt-notice {
+  color: #888;
+  font-size: 0.85rem;
+  font-style: italic;
+  margin-top: 0.5rem;
+  line-height: 1.4;
+}