feat(dashboard): add hide/show toggle for dashboard plugins in sidebar

- New config key: dashboard.hidden_plugins (list of plugin names)
- GET /api/dashboard/plugins now filters out hidden plugins from sidebar
- POST /api/dashboard/plugins/{name}/visibility toggles visibility
- Hub response includes user_hidden boolean per plugin row
- Eye/EyeOff toggle on plugin cards with dashboard manifests
- i18n: 'Show in sidebar' / 'Hide from sidebar' (en/zh)

web/src/i18n/en.ts

@@ -295,6 +295,8 @@ export const en: Translations = {
     authRequiredHint: "Run this command to authenticate:",
     updateGit: "Git pull",
     versionBadge: "Version",
+    showInSidebar: "Show in sidebar",
+    hideFromSidebar: "Hide from sidebar",
   },
 
   skills: {

web/src/i18n/types.ts

@@ -266,6 +266,8 @@ export interface Translations {
     authRequiredHint: string;
     updateGit: string;
     versionBadge: string;
+    showInSidebar: string;
+    hideFromSidebar: string;
   };
 
   // ── Profiles page ──

web/src/i18n/zh.ts

@@ -291,6 +291,8 @@ export const zh: Translations = {
     authRequiredHint: "运行此命令以完成认证：",
     updateGit: "git pull",
     versionBadge: "版本",
+    showInSidebar: "在侧边栏显示",
+    hideFromSidebar: "从侧边栏隐藏",
   },
 
   skills: {