Add static color for simple devices, change auto-shutdown to auto-restore

- Add `static_color` capability to Adalight provider with `set_color()` method
- Add `static_color` field to Device model, DeviceState, and API schemas
- Add GET/PUT `/devices/{id}/color` API endpoints
- Change auto-shutdown behavior: restore device to idle state instead of
  powering off (WLED uses snapshot/restore, Adalight sends static color
  or black frame)
- Rename `_auto_shutdown_device_if_idle` to `_restore_device_idle_state`
- Add inline color picker on device cards for devices with static_color
- Add auto_shutdown toggle to device settings modal
- Update labels from "Auto Shutdown" to "Auto Restore" (en + ru)
- Remove backward-compat KC aliases from ProcessorManager
- Align card action buttons to bottom with flex column layout

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

server/src/wled_controller/static/index.html

@@ -297,6 +297,18 @@
                         <input type="number" id="settings-health-interval" min="5" max="600" value="30">
                     </div>
 
+                    <div class="form-group settings-toggle-group">
+                        <div class="label-row">
+                            <label data-i18n="settings.auto_shutdown">Auto Restore:</label>
+                            <button type="button" class="hint-toggle" onclick="toggleHint(this)" title="?">?</button>
+                        </div>
+                        <small class="input-hint" style="display:none" data-i18n="settings.auto_shutdown.hint">Restore device to idle state when targets stop or server shuts down</small>
+                        <label class="settings-toggle">
+                            <input type="checkbox" id="settings-auto-shutdown">
+                            <span class="settings-toggle-slider"></span>
+                        </label>
+                    </div>
+
                     <div id="settings-error" class="error-message" style="display: none;"></div>
                 </form>
             </div>