feat: 上传压缩改按需(>1MB) + 特殊文件夹 6340 兜底用户

- PhotoWallPage: 仅当原文件 >1MB 才 Canvas 压缩,小图原样上传
- auth.rs: seed 兜底表新增 UserTest6340(本地无 DB 时用;线上走 wall_users 表)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Client/src/components/PhotoWallPage.tsx

@@ -551,8 +551,8 @@ export function PhotoWallPage({ onExit, token, folderName, isAdmin, onForbidden
             showToast(`已达上限（${maxItems} 条）`)
             return
           }
-          // 客户端压缩（大图缩小 + 转 JPEG q=0.78）
+          // 客户端压缩：仅当原文件 > 1MB 时才压（大图缩小 + 转 JPEG q=0.78），小图原样上传
-          const src = await compressImage(rawSrc)
+          const src = file.size > 1024 * 1024 ? await compressImage(rawSrc) : rawSrc
           const uploadFn = isPersonal
             ? (t: string, d: string) => uploadPhoto(t, d)
             : (t: string, d: string) => uploadFolderPhoto(t, folderName!, d)

Server/src/auth.rs

@@ -222,6 +222,11 @@ impl WallUserStore {
             "UserTest".to_string(),
             "76f03f2eaa05e66c82d25e168fec27e7d0d202f15da73aa5852562f863633b8e".to_string(),
         );
+        // UserTest6340 / 2019.01.6340
+        users.insert(
+            "UserTest6340".to_string(),
+            "c7780d075f561283ae4665a64d8b8e2642389ad948390a542b847833a7ce7c1a".to_string(),
+        );
         WallUserStore::Memory(users)
     }