```

feat(base): 添加邮箱注册码功能及用户注册接口

- 在 `sessionManager` 中新增邮件注册码缓存管理实例和相关方法
- 实现生成、保存、验证、删除邮件注册码的逻辑
- 新增 `/reg` 和 `/email` 接口用于用户注册和发送验证码
- 引入 `golang-lru` 依赖以支持限流缓存功能
- 调整包导入顺序，优化代码结构
```

common/utils/golang-lru-main/simplelru/lru_interface.go

@@ -0,0 +1,49 @@
+// Copyright IBM Corp. 2014, 2025
+// SPDX-License-Identifier: MPL-2.0
+
+// Package simplelru provides simple LRU implementation based on build-in container/list.
+package simplelru
+
+// LRUCache is the interface for simple LRU cache.
+type LRUCache[K comparable, V any] interface {
+	// Adds a value to the cache, returns true if an eviction occurred and
+	// updates the "recently used"-ness of the key.
+	Add(key K, value V) bool
+
+	// Returns key's value from the cache and
+	// updates the "recently used"-ness of the key. #value, isFound
+	Get(key K) (value V, ok bool)
+
+	// Checks if a key exists in cache without updating the recent-ness.
+	Contains(key K) (ok bool)
+
+	// Returns key's value without updating the "recently used"-ness of the key.
+	Peek(key K) (value V, ok bool)
+
+	// Removes a key from the cache.
+	Remove(key K) bool
+
+	// Removes the oldest entry from cache.
+	RemoveOldest() (K, V, bool)
+
+	// Returns the oldest entry from the cache. #key, value, isFound
+	GetOldest() (K, V, bool)
+
+	// Returns a slice of the keys in the cache, from oldest to newest.
+	Keys() []K
+
+	// Values returns a slice of the values in the cache, from oldest to newest.
+	Values() []V
+
+	// Returns the number of items in the cache.
+	Len() int
+
+	// Returns the capacity of the cache.
+	Cap() int
+
+	// Clears all cache entries.
+	Purge()
+
+	// Resizes cache, returning number evicted
+	Resize(int) int
+}