webui: Add user birthday settings

- Store birth month and day in user_pref with default 10/18
- Migrate existing user_pref rows to fill missing birthday fields
- Expose birthday editing in the webui profile page
- Replace hardcoded birthday values in user info, top info, and product list responses
- Fix birthday month/day field alignment in the profile form

Signed-off-by: Sean Du <do4suki@gmail.com>

internal/handler/api/login/login.go

@@ -11,7 +11,7 @@ func LoginApi(ctx *gin.Context, action string) (res any, err error) {
 	case "topInfo":
 		res, err = loginTopInfo(ctx)
 	case "topInfoOnce":
-		res, err = loginTopInfoOnce()
+		res, err = loginTopInfoOnce(ctx)
 	default:
 		err = fmt.Errorf("unimplemented action: login: %s", action)
 	}