fix: add missing GET /tasks/tags endpoint to OpenAPI routes

The GetTags handler already exists in TaskController with proper Swagger
annotations, but was only registered in the internal API routes
(/api/v1/tasks/tags) and missing from the OpenAPI routes
(/open2api/v1/tasks/tags). This commit adds the missing route
registration so the endpoint is accessible via Bearer Token.

internal/router/openapi.go

@@ -35,6 +35,7 @@ func registerOpenAPITaskRoutes(g *gin.RouterGroup, c *Controllers) {
 		tasks.PUT("/:id", c.Task.UpdateTask)
 		tasks.DELETE("/:id", c.Task.DeleteTask)
 		tasks.POST("/stop/:logID", c.Task.StopTask)
+		tasks.GET("/tags", c.Task.GetTags)
 	}
 }