feat: allow enabling all plugins into a channel

internal/admin/templates/channel_detail.html

@@ -27,6 +27,15 @@
                         <!-- Add a hidden field to ensure a value is sent even when checkbox is unchecked -->
                         <input type="hidden" name="form_submitted" value="true">
                     </div>
+                    <div class="mb-3">
+                        <label class="form-check form-switch">
+                            <input class="form-check-input" type="checkbox" name="enable_all_plugins" value="true" {{if .Channel.EnableAllPlugins}}checked{{end}}>
+                            <span class="form-check-label">Enable All Plugins</span>
+                        </label>
+                        <div class="form-help">
+                            When enabled, all registered plugins will be automatically enabled for this channel. Individual plugin settings will be ignored.
+                        </div>
+                    </div>
                     <div class="form-footer">
                         <button type="submit" class="btn btn-primary">Save</button>
                         <a href="/admin/channels" class="btn btn-link">Back to Channels</a>