fix: ensure ZADD keeps the last score for duplicate members in a single command to align with Redis behavior

[Mixficsol]

修复bug #3078 : 修正 pika 中 zadd 命令在单行多次添加同一 member 时与 Redis 行为不一致的问题

问题重现

执行zadd key score1 member1 score2 member1返回score1的原因

在 src/storage/src/redis_zsets.cc 文件中，RedisZSets::ZAdd 函数存在问题：源代码在这里是从前往后读取score_members数组的，导致与src/pika_cache.cc中的PikaCache::ZAddIfKeyExist函数的从后往前读取score_members数组冲突，程序未能读取到正确的缓存数据。

修改文件部分

• 在src/storage/src/redis_zsets.cc 文件中修改了对score_members数组的从后往前读取方式，与PikaCache::ZAddIfKeyExist中的unordered_set+list的方式一致。
• 在zset_test.go文件中追加了测试用例并通过了测试。

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Reviewing files that changed from the base of the PR and between 31af47a and 5d5bfd4.

📒 Files selected for processing (3)

• CMakeLists.txt (1 hunks)
• src/pika_admin.cc (1 hunks)
• src/storage/src/redis_zsets.cc (1 hunks)

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