feat: PasswordResetBegin of auth controller;

fix: sql query updateLoginInformationByUsername used in-database hashing;
refactor: renamed LogOutAccounts into LogOutSessions in models/auth;
refactor: added error checks on opening transactions for all auth service methods;
refactor: added error checks on commiting transactions likewise;
refactor: simplified PasswordResetBegin logic;
feat: implemented PasswordResetComplete method of auth service;

backend/internal/controllers/auth.go

@@ -89,7 +89,24 @@ func (a *authControllerImpl) Login(c *gin.Context) {
 // @Success 200 "Reset code sent to the email if it is attached to an account"
 // @Failure 429 "Too many recent requests for this email"
 func (a *authControllerImpl) PasswordResetBegin(c *gin.Context) {
-	c.Status(http.StatusNotImplemented)
+	request, ok := utils.GetRequest[models.PasswordResetBeginRequest](c)
+	if !ok {
+		c.Status(http.StatusBadRequest)
+		return
+	}
+
+	response, err := a.auth.PasswordResetBegin(request.Body)
+	if err != nil {
+		if errors.Is(err, errs.ErrTooManyRequests) {
+			c.Status(http.StatusTooManyRequests)
+		} else {
+			c.Status(http.StatusInternalServerError)
+		}
+		return
+	}
+
+	c.JSON(http.StatusOK, response)
+	return
 }
 
 // @Summary Complete password reset via email code