Change SSO authentication request method from POST to GET

- Modify HTTP request method in AuthMiddleware from POST to GET
- Ensure compatibility with SSO service authentication endpoint

internal/middleware/auth.go

@@ -34,7 +34,7 @@ func AuthMiddleware(ssoUrl string) gin.HandlerFunc {
 		}
 
 		// Create request to SSO service
-		req, err := http.NewRequest(http.MethodPost, ssoUrl, nil)
+		req, err := http.NewRequest(http.MethodGet, ssoUrl, nil)
 		if err != nil {
 			utils.AssembleResponse(c, nil, utils.ErrInternalServer)
 			c.Abort()