fix: move debug mode toggle to proper settings location

The debug toggle was incorrectly added to settings.html (SillyTavern Extensions tab).
It should be in template.html (RPG Companion Settings popup) where all the
other extension settings are.

Changes:
- template.html: Added debug mode checkbox in Display Options section
- index.js: Added event listener and initial state setter
- settings.html: Removed incorrect debug toggle placement

Now users can find the debug toggle by clicking the gear icon in the RPG panel,
under Display Options, right below "Show Plot Progression Buttons".

template.html

@@ -195,6 +195,14 @@
                 <small style="display: block; margin-left: 24px; margin-top: -8px; color: #888; font-size: 11px;">
                     Display buttons above chat input for plot progression prompts
                 </small>
+
+                <label class="checkbox_label">
+                    <input type="checkbox" id="rpg-toggle-debug-mode" />
+                    <span>🔍 Enable Debug Mode (Mobile-Friendly)</span>
+                </label>
+                <small style="display: block; margin-left: 24px; margin-top: -8px; color: #888; font-size: 11px;">
+                    Shows parser logs in a mobile-friendly UI panel. Useful for troubleshooting. Look for the red bug button.
+                </small>
             </div>
 
             <div class="rpg-settings-group">