feat(api): add route validation endpoint with WebSocket support

Adds a new `/route/validate` endpoint that accepts YAML-encoded route
configurations for validation. Supports both synchronous HTTP requests
and real-time streaming via WebSocket for interactive validation workflows.

Changes:
- Implement Validate handler with YAML binding in route/validate.go
- Add WebSocket manager for streaming validation results
- Register GET/POST routes in handler.go
- Regenerate Swagger documentation

internal/api/v1/route/validate.go

@@ -0,0 +1,69 @@
+package routeApi
+
+import (
+	"net/http"
+	"time"
+
+	"github.com/gin-gonic/gin"
+	"github.com/goccy/go-yaml"
+	"github.com/yusing/godoxy/internal/route"
+	"github.com/yusing/godoxy/internal/serialization"
+	apitypes "github.com/yusing/goutils/apitypes"
+	"github.com/yusing/goutils/http/httpheaders"
+	"github.com/yusing/goutils/http/websocket"
+)
+
+type _ = route.Route
+
+// @x-id			"validate"
+// @BasePath	/api/v1
+// @Summary		Validate route
+// @Description	Validate route,
+// @Tags			route,websocket
+// @Accept		application/yaml
+// @Produce		json
+// @Param			route body route.Route true "Route"
+// @Success		200		{object}	apitypes.SuccessResponse "Route validated"
+// @Failure		400		{object}	apitypes.ErrorResponse "Bad request"
+// @Failure		403		{object}	apitypes.ErrorResponse "Forbidden"
+// @Failure		417		{object}	any "Validation failed"
+// @Failure		500		{object}	apitypes.ErrorResponse "Internal server error"
+// @Router		/route/validate [get]
+// @Router		/route/validate [post]
+func Validate(c *gin.Context) {
+	if httpheaders.IsWebsocket(c.Request.Header) {
+		ValidateWS(c)
+		return
+	}
+	var request route.Route
+	if err := c.ShouldBindWith(&request, serialization.GinYAMLBinding{}); err != nil {
+		c.JSON(http.StatusExpectationFailed, err)
+		return
+	}
+	c.JSON(http.StatusOK, apitypes.Success("route validated"))
+}
+
+func ValidateWS(c *gin.Context) {
+	manager, err := websocket.NewManagerWithUpgrade(c)
+	if err != nil {
+		c.Error(apitypes.InternalServerError(err, "failed to upgrade to websocket"))
+		return
+	}
+	defer manager.Close()
+
+	const writeTimeout = 5 * time.Second
+
+	for {
+		select {
+		case <-manager.Done():
+			return
+		case msg := <-manager.ReadCh():
+			var request route.Route
+			if err := serialization.UnmarshalValidate(msg, &request, yaml.Unmarshal); err != nil {
+				manager.WriteJSON(gin.H{"error": err}, writeTimeout)
+				continue
+			}
+			manager.WriteJSON(gin.H{"message": "route validated"}, writeTimeout)
+		}
+	}
+}