fix: handler.go 心跳/版本号/CheckOrigin/历史上限改为配置驱动

- 心跳间隔和超时从 config.Server 读取
- ServerVersion 从 config.App.Version 读取
- CheckOrigin 通过 config.Server.AllowedOrigins 控制
- GetHistory limit 从 config.Session.MaxHistory 读取

backend/internal/ws/handler.go

@@ -10,6 +10,7 @@ import (
 	"github.com/gin-gonic/gin"
 	"github.com/gorilla/websocket"
 
+	"github.com/hhs/camtalk/internal/config"
 	"github.com/hhs/camtalk/internal/errors"
 	"github.com/hhs/camtalk/internal/logger"
 	"github.com/hhs/camtalk/internal/models"
@@ -17,8 +18,23 @@ import (
 	"github.com/hhs/camtalk/internal/session"
 )
 
-var upgrader = websocket.Upgrader{
-	CheckOrigin: func(r *http.Request) bool { return true }, // 开发阶段允许所有来源
+// newUpgrader 根据配置创建 WebSocket upgrader。
+func newUpgrader(cfg *config.Config) websocket.Upgrader {
+	allowedOrigins := cfg.Server.AllowedOrigins
+	return websocket.Upgrader{
+		CheckOrigin: func(r *http.Request) bool {
+			if len(allowedOrigins) == 0 {
+				return true // 未配置则允许所有来源（开发模式）
+			}
+			origin := r.Header.Get("Origin")
+			for _, o := range allowedOrigins {
+				if o == origin || o == "*" {
+					return true
+				}
+			}
+			return false
+		},
+	}
 }
 
 // Client 代表一个 WebSocket 客户端连接。
@@ -75,13 +91,21 @@ func (w *WSClient) SendError(err models.WsError) error {
 }
 
 // ServeWS 处理 WebSocket 升级请求。
-func ServeWS(sessionMgr session.Manager, orch orchestrator.Orchestrator) gin.HandlerFunc {
+func ServeWS(sessionMgr session.Manager, orch orchestrator.Orchestrator, cfg *config.Config) gin.HandlerFunc {
+	upgrader := newUpgrader(cfg)
+	heartbeatInterval := time.Duration(cfg.Server.HeartbeatInterval) * time.Second
+	heartbeatTimeout := time.Duration(cfg.Server.HeartbeatTimeout) * time.Second
+	version := cfg.App.Version
+
+	maxHistory := cfg.Session.MaxHistory
+
 	return func(c *gin.Context) {
-		serveWS(c, sessionMgr, orch)
+		serveWS(c, sessionMgr, orch, upgrader, heartbeatInterval, heartbeatTimeout, version, maxHistory)
 	}
 }
 
-func serveWS(c *gin.Context, sessionMgr session.Manager, orch orchestrator.Orchestrator) {
+func serveWS(c *gin.Context, sessionMgr session.Manager, orch orchestrator.Orchestrator,
+	upgrader websocket.Upgrader, heartbeatInterval, heartbeatTimeout time.Duration, version string, maxHistory int) {
 	conn, err := upgrader.Upgrade(c.Writer, c.Request, nil)
 	if err != nil {
 		logger.Log.Errorw("websocket upgrade failed", "error", err)
@@ -108,7 +132,7 @@ func serveWS(c *gin.Context, sessionMgr session.Manager, orch orchestrator.Orche
 	_ = client.SendJSON(models.WsConnected{
 		Type:          "connected",
 		SessionID:     sessionID,
-		ServerVersion: "0.1.0",
+		ServerVersion: version,
 	})
 	logger.Log.Infow("client connected", "session", sessionID)
 
@@ -122,12 +146,12 @@ func serveWS(c *gin.Context, sessionMgr session.Manager, orch orchestrator.Orche
 	// 启动心跳检查 goroutine
 	done := make(chan struct{})
 	go func() {
-		ticker := time.NewTicker(30 * time.Second)
+		ticker := time.NewTicker(heartbeatInterval)
 		defer ticker.Stop()
 		for {
 			select {
 			case <-ticker.C:
-				if time.Since(lastPong) > 60*time.Second {
+				if time.Since(lastPong) > heartbeatTimeout {
 					logger.Log.Warnw("heartbeat timeout", "session", sessionID)
 					conn.Close()
 					return
@@ -181,7 +205,7 @@ func serveWS(c *gin.Context, sessionMgr session.Manager, orch orchestrator.Orche
 			}
 
 			// 获取对话历史
-			history, _ := client.sessionMgr.GetHistory(context.Background(), sessionID, 20)
+			history, _ := client.sessionMgr.GetHistory(context.Background(), sessionID, maxHistory)
 
 			// 创建可取消的 context
 			ctx, cancel := context.WithCancel(context.Background())