Replace auto-start with startup automation, add card colors to dashboard

- Add `startup` automation condition type that activates on server boot,
  replacing the per-target `auto_start` flag
- Remove `auto_start` field from targets, scene snapshots, and all API layers
- Remove auto-start UI section and star buttons from dashboard and target cards
- Remove `color` field from scene presets (backend, API, modal, frontend)
- Add card color support to scene preset cards (color picker + border style)
- Show localStorage-backed card colors on all dashboard cards (targets,
  automations, sync clocks, scene presets)
- Fix card color picker updating wrong card when duplicate data attributes
  exist by using closest() from picker wrapper instead of global querySelector
- Add sync clocks step to Sources tab tutorial
- Bump SW cache v9 → v10

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

server/src/wled_controller/static/locales/zh.json

@@ -262,6 +262,7 @@
   "tour.src.processed": "处理 — 应用后处理效果，如模糊、亮度或色彩校正。",
   "tour.src.audio": "音频 — 分析麦克风或系统音频以实现响应式 LED 效果。",
   "tour.src.value": "数值 — 用于自动化条件的数字数据源。",
+  "tour.src.sync": "同步时钟 — 在多个源之间同步动画的共享定时器。",
   "tour.auto.list": "自动化 — 基于时间、音频或数值条件自动激活场景。",
   "tour.auto.add": "点击 + 创建包含条件和要激活场景的新自动化。",
   "tour.auto.card": "每张卡片显示自动化状态、条件和快速编辑/切换控制。",
@@ -584,7 +585,9 @@
   "automations.conditions.add": "添加条件",
   "automations.conditions.empty": "无条件 — 启用后自动化始终处于活动状态",
   "automations.condition.always": "始终",
-  "automations.condition.always.hint": "自动化启用后立即激活并保持活动。用于服务器启动时自动激活场景。",
+  "automations.condition.always.hint": "自动化启用后立即激活并保持活动。",
+  "automations.condition.startup": "启动",
+  "automations.condition.startup.hint": "服务器启动时激活，启用期间保持活动。",
   "automations.condition.application": "应用程序",
   "automations.condition.application.apps": "应用程序：",
   "automations.condition.application.apps.hint": "进程名，每行一个（例如 firefox.exe）",
@@ -657,8 +660,6 @@
   "scenes.name.placeholder": "我的场景",
   "scenes.description": "描述：",
   "scenes.description.hint": "此场景功能的可选描述",
-  "scenes.color": "卡片颜色：",
-  "scenes.color.hint": "仪表盘上场景卡片的强调色",
   "scenes.targets": "目标:",
   "scenes.targets.hint": "选择要包含在此场景快照中的目标",
   "scenes.capture": "捕获",
@@ -680,10 +681,6 @@
   "scenes.error.activate_failed": "激活场景失败",
   "scenes.error.recapture_failed": "重新捕获场景失败",
   "scenes.error.delete_failed": "删除场景失败",
-  "autostart.title": "自动启动目标",
-  "autostart.toggle.enabled": "自动启动已启用",
-  "autostart.toggle.disabled": "自动启动已禁用",
-  "autostart.goto_target": "跳转到目标",
   "time.hours_minutes": "{h}时 {m}分",
   "time.minutes_seconds": "{m}分 {s}秒",
   "time.seconds": "{s}秒",
@@ -1110,13 +1107,11 @@
   "dashboard.error.automation_toggle_failed": "切换自动化失败",
   "dashboard.error.start_failed": "启动处理失败",
   "dashboard.error.stop_failed": "停止处理失败",
-  "dashboard.error.autostart_toggle_failed": "切换自动启动失败",
   "dashboard.error.stop_all": "停止所有目标失败",
   "target.error.editor_open_failed": "打开目标编辑器失败",
   "target.error.start_failed": "启动目标失败",
   "target.error.stop_failed": "停止目标失败",
   "target.error.clone_failed": "克隆目标失败",
-  "target.error.autostart_toggle_failed": "切换自动启动失败",
   "target.error.delete_failed": "删除目标失败",
   "targets.stop_all.none_running": "当前没有运行中的目标",
   "targets.stop_all.stopped": "已停止 {count} 个目标",