feat: Introduce settings package and refactor constants

- Added a new `setting` package to replace the `constant` package for configuration management, improving code organization and clarity.
- Moved various configuration variables such as `ServerAddress`, `PayAddress`, and `SensitiveWords` to the new `setting` package.
- Updated references throughout the codebase to use the new `setting` package, ensuring consistent access to configuration values.
- Introduced new files for managing chat settings and midjourney settings, enhancing modularity and maintainability of the code.

service/worker.go

@@ -5,20 +5,20 @@ import (
 	"fmt"
 	"net/http"
 	"one-api/common"
-	"one-api/constant"
+	"one-api/setting"
 	"strings"
 )
 
 func DoImageRequest(originUrl string) (resp *http.Response, err error) {
-	if constant.EnableWorker() {
+	if setting.EnableWorker() {
 		common.SysLog(fmt.Sprintf("downloading image from worker: %s", originUrl))
-		workerUrl := constant.WorkerUrl
+		workerUrl := setting.WorkerUrl
 		if !strings.HasSuffix(workerUrl, "/") {
 			workerUrl += "/"
 		}
 		// post request to worker
-		data := []byte(`{"url":"` + originUrl + `","key":"` + constant.WorkerValidKey + `"}`)
-		return http.Post(constant.WorkerUrl, "application/json", bytes.NewBuffer(data))
+		data := []byte(`{"url":"` + originUrl + `","key":"` + setting.WorkerValidKey + `"}`)
+		return http.Post(setting.WorkerUrl, "application/json", bytes.NewBuffer(data))
 	} else {
 		common.SysLog(fmt.Sprintf("downloading image from origin: %s", originUrl))
 		return http.Get(originUrl)