refactor: 优化分类和系列页面的别名表单标签结构

src/routes/admin/categories/+page.svelte

@@ -55,10 +55,11 @@
 				/>
 			</div>
 			<div class="form-group">
-				<div
-					style="display: flex; justify-content: space-between; align-items: center; margin-bottom: 0.5rem;"
+				<label
+					for="slug"
+					style="display: flex; justify-content: space-between; align-items: center;"
 				>
-					<label for="slug" style="margin: 0;">别名</label>
+					<span>别名</span>
 					<button
 						type="button"
 						style="background: none; border: none; padding: 0; color: #666; font-size: 0.8rem; cursor: pointer; outline: none;"
@@ -67,7 +68,7 @@
 					>
 						{isGenerating ? '正在生成...' : '重新生成'}
 					</button>
-				</div>
+				</label>
 				<input
 					type="text"
 					id="slug"

src/routes/admin/series/+page.svelte

@@ -49,10 +49,11 @@
 				required
 			/>
 
-			<div
-				style="display: flex; justify-content: space-between; align-items: center; margin-bottom: 0.5rem;"
+			<label
+				for="slug"
+				style="display: flex; justify-content: space-between; align-items: center;"
 			>
-				<label for="slug" style="margin: 0;">URL 别名 *</label>
+				<span>URL 别名 *</span>
 				<button
 					type="button"
 					style="background: none; border: none; padding: 0; color: #666; font-size: 0.8rem; cursor: pointer; outline: none;"
@@ -61,7 +62,7 @@
 				>
 					{isGenerating ? '正在生成...' : '重新生成'}
 				</button>
-			</div>
+			</label>
 			<input
 				id="slug"
 				name="slug"