fix(server): improve message handling and data privacy

- fix unread count calculation logic in message repository
- implement logic to retrieve other participant's last read sequence in conversation handlers
- mask real names in verification record responses for privacy
- improve error reporting in main entry point by using stderr instead of zap logger during initialization

cmd/server/main.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"context"
+	"fmt"
 	"os"
 	"os/signal"
 	"syscall"
@@ -14,9 +15,8 @@ func main() {
 	// 初始化应用程序（Wire 自动生成）
 	app, err := InitializeApp()
 	if err != nil {
-		zap.L().Fatal("failed to initialize app",
-			zap.Error(err),
-		)
+		fmt.Fprintf(os.Stderr, "failed to initialize app: %v\n", err)
+		os.Exit(1)
 	}
 
 	// 启动应用程序