fix: 改进评论获取接口的slug规范化处理

修复当post_slug参数为根路径或包含查询参数/锚点时，slug列表生成逻辑不正确的问题。现在会先去除查询参数和锚点，然后正确处理根路径和带斜杠的变体。

新增单元测试验证各种slug格式的规范化行为，包括相对路径、完整URL和根路径。

cwd-api/src/api/public/getComments.ts

@@ -30,7 +30,15 @@ export const getComments = async (c: Context<{ Bindings: Bindings }>) => {
       slugList = Array.from(new Set([withSlash, withoutSlash]))
     }
   } catch {
-    slugList = [postSlug]
+    const path = postSlug.split('?')[0].split('#')[0]
+    if (path === '/' || path === '') {
+      slugList = ['/']
+    } else {
+      const hasTrailingSlash = path.endsWith('/')
+      const withSlash = hasTrailingSlash ? path : path + '/'
+      const withoutSlash = hasTrailingSlash ? path.slice(0, -1) : path
+      slugList = Array.from(new Set([withSlash, withoutSlash]))
+    }
   }
 
   try {