refactor: update UI styles to use new header background color

- Changed background color for various select elements and containers in Users.vue and Videos.vue to use 'bg-header'.
- Updated background color for status and role filters in the admin section.
- Adjusted background colors in Home.vue, QuickActions.vue, and other components to enhance UI consistency.
- Refactored Billing.vue and DomainsDns.vue to align with new design standards.
- Modified settings components to utilize new header color for better visual hierarchy.
- Improved accessibility and visual feedback in the SettingsRow and SettingsSectionCard components.
- Updated authentication middleware to include timestamp cookie for session management.
- Enhanced gRPC client to build internal metadata for service calls.

uno.config.ts

@@ -179,9 +179,10 @@ export default defineConfig({
         light: "#f8f9fa",
       },
       border: {
-        DEFAULT: "#e6e7e2",
+        DEFAULT: "#d0d7de",
         light: "#f8f9fa",
       },
+      header: '#f6f8fa',
       // bg: {
       //   page:    "#faf8f8", // nền toàn trang
       //   surface: "#ffffff", // card, modal, table