🐛 fix(connection-package): 导出/导入连接包携带 Redis DB 别名

- 连接包 payload 与导出选项支持 redisDbAliases（连接 ID → db 序号 → 别名）
- 导入返回 ConnectionPackageImportResult，一并恢复别名映射
- 前端导出时注入 appearance.redisDbAliases，导入后 merge 回 appearance
- 补充别名往返测试与 mergeRedisDbAliases 单元测试

frontend/src/utils/redisDbAlias.test.ts

@@ -4,6 +4,7 @@ import {
   MAX_REDIS_DB_ALIAS_LENGTH,
   buildRedisDbNodeLabel,
   getRedisDbAlias,
+  mergeRedisDbAliases,
   sanitizeRedisDbAlias,
   sanitizeRedisDbAliases,
   setRedisDbAlias,
@@ -76,4 +77,20 @@ describe('redisDbAlias helpers', () => {
   it('does not append key counts to the sidebar label', () => {
     expect(buildRedisDbNodeLabel(0, '12')).toBe('db0 12');
   });
+
+  it('merges imported aliases over local ones without dropping unrelated labels', () => {
+    const current = {
+      'conn-a': { '0': 'local-cache', '1': 'local-queue' },
+      'conn-b': { '0': 'sessions' },
+    };
+    const incoming = {
+      'conn-a': { '0': 'imported-cache' },
+      'conn-c': { '2': 'metrics' },
+    };
+    expect(mergeRedisDbAliases(current, incoming)).toEqual({
+      'conn-a': { '0': 'imported-cache', '1': 'local-queue' },
+      'conn-b': { '0': 'sessions' },
+      'conn-c': { '2': 'metrics' },
+    });
+  });
 });

frontend/src/utils/redisDbAlias.ts

@@ -126,6 +126,26 @@ export const setRedisDbAlias = (
   return next;
 };
 
+/**
+ * Merge imported Redis DB aliases into the local map. Imported labels win for
+ * the same connection + DB index; unrelated local aliases are preserved.
+ */
+export const mergeRedisDbAliases = (
+  current: RedisDbAliasMap | undefined,
+  incoming: RedisDbAliasMap | undefined,
+): RedisDbAliasMap => {
+  const base = sanitizeRedisDbAliases(current);
+  const imported = sanitizeRedisDbAliases(incoming);
+  const next: RedisDbAliasMap = { ...base };
+  Object.entries(imported).forEach(([connectionId, aliases]) => {
+    next[connectionId] = {
+      ...(base[connectionId] || {}),
+      ...aliases,
+    };
+  });
+  return next;
+};
+
 /**
  * Build the sidebar label for a Redis DB node. Returns `dbN` when there is no
  * alias, and `dbN alias` when one is set. Key counts are intentionally not