style: update surface colors and typography for improved contrast and readability across various components

- Changed text colors from surface-400 to surface-600 and surface-500 to surface-700 for better visibility in multiple Svelte files.
- Updated background and border colors in app.css for a more cohesive industrial design.
- Adjusted font weights and sizes for headings, labels, and buttons to enhance clarity and user experience.
- Refined styles for tables, badges, and buttons to align with the new design language.
- Added new styles for input fields and switches to maintain consistency in the UI.

hub/admin-web/src/lib/components/FolderNode.svelte

@@ -27,21 +27,21 @@
 <div>
 	<button
 		type="button"
-		class="flex w-full items-center gap-2.5 rounded-lg px-3 py-2.5 text-left text-sm transition hover:bg-surface-100"
+		class="flex w-full items-center gap-2.5 px-3 py-2.5 text-left text-sm transition hover:bg-surface-100"
 		onclick={() => (open = !open)}
 	>
-		<span class="w-3.5 text-center text-xs text-surface-400">{open ? '▾' : '▸'}</span>
-		<span class="flex h-7 w-7 items-center justify-center rounded-md bg-warning-50 text-warning-700">
+		<span class="w-3.5 text-center text-xs text-surface-600">{open ? '▾' : '▸'}</span>
+		<span class="flex h-7 w-7 items-center justify-center border border-warning-300 bg-warning-50 text-warning-800">
 			<Icon name="folder" class="h-4 w-4" />
 		</span>
-		<span class="min-w-0 flex-1 truncate font-medium text-surface-800">{folder.name}</span>
+		<span class="min-w-0 flex-1 truncate font-medium text-surface-900">{folder.name}</span>
 		<span class="saas-badge-neutral">{folder.projectCount} 项目</span>
 		{#if folder.childFolderCount > 0}
 			<span class="saas-badge-neutral">{folder.childFolderCount} 子夹</span>
 		{/if}
 	</button>
 	{#if open}
-		<div class="ml-4 border-l border-surface-200 pl-2">
+		<div class="ml-4 border-l border-surface-300 pl-2">
 			<FolderTree {folders} {projects} parentId={folder.id} {slug} />
 		</div>
 	{/if}