架构优化

electron/services/messageCacheService.ts

@@ -13,8 +13,10 @@ export class MessageCacheService {
   private static readonly CACHE_VERSION = 3
   private readonly cacheFilePath: string
   private cache: Record<string, SessionMessageCacheEntry> = {}
-  private readonly sessionLimit = 150
-  private readonly maxSessionEntries = 48
+  // 每会话 80 条已覆盖首屏渲染（DB 拉取会随后补全），48→24 个会话、150→80 条
+  // 可把该缓存的常驻内存压到原来的 1/4 左右
+  private readonly sessionLimit = 80
+  private readonly maxSessionEntries = 24
   private persistTimer: ReturnType<typeof setTimeout> | null = null
   private persistInFlight = false
   private persistQueued = false