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/style.css

@@ -231,6 +231,8 @@ section {
     padding: 12px 20px 20px;
     position: relative;
     transition: transform 0.2s, box-shadow 0.2s;
+    display: flex;
+    flex-direction: column;
 }
 
 .card:hover {
@@ -739,6 +741,40 @@ section {
     pointer-events: none;
 }
 
+/* Static color picker — inline in card-subtitle */
+.static-color-control {
+    display: inline-flex;
+    align-items: center;
+    gap: 4px;
+}
+
+.static-color-picker {
+    width: 22px;
+    height: 18px;
+    padding: 0;
+    border: 1px solid var(--border-color);
+    border-radius: 3px;
+    cursor: pointer;
+    background: none;
+    vertical-align: middle;
+}
+
+.btn-clear-color {
+    background: none;
+    border: none;
+    color: #777;
+    font-size: 0.75rem;
+    cursor: pointer;
+    padding: 0 2px;
+    line-height: 1;
+    border-radius: 3px;
+    transition: color 0.2s;
+}
+
+.btn-clear-color:hover {
+    color: var(--danger-color);
+}
+
 .section-header {
     display: flex;
     align-items: center;
@@ -779,6 +815,54 @@ ul.section-tip li {
     margin-bottom: 15px;
 }
 
+.settings-toggle-group {
+    display: flex;
+    flex-direction: column;
+}
+
+.settings-toggle {
+    position: relative;
+    display: inline-block;
+    width: 34px;
+    height: 18px;
+    cursor: pointer;
+    margin-top: 4px;
+}
+
+.settings-toggle input {
+    opacity: 0;
+    width: 0;
+    height: 0;
+}
+
+.settings-toggle-slider {
+    position: absolute;
+    inset: 0;
+    background: var(--border-color);
+    border-radius: 9px;
+    transition: background 0.2s;
+}
+
+.settings-toggle-slider::after {
+    content: '';
+    position: absolute;
+    top: 2px;
+    left: 2px;
+    width: 14px;
+    height: 14px;
+    background: white;
+    border-radius: 50%;
+    transition: transform 0.2s;
+}
+
+.settings-toggle input:checked + .settings-toggle-slider {
+    background: var(--primary-color);
+}
+
+.settings-toggle input:checked + .settings-toggle-slider::after {
+    transform: translateX(16px);
+}
+
 label {
     display: block;
     margin-bottom: 5px;