feat(api): add endpoint to retrieve container stats

- Introduced a new GET endpoint `/docker/stats/:id` to fetch statistics for a specified container by its ID or route alias.
- Implemented the `Stats` function in the `dockerapi` package to handle the request and return container stats in both JSON and WebSocket formats.
- Added error handling for invalid requests and container not found scenarios.

internal/api/handler.go

@@ -140,6 +140,7 @@ func NewHandler(requireAuth bool) *gin.Engine {
 			docker.POST("/start", dockerApi.Start)
 			docker.POST("/stop", dockerApi.Stop)
 			docker.POST("/restart", dockerApi.Restart)
+			docker.GET("/stats/:id", dockerApi.Stats)
 		}
 	}