feat: Add Admin Groups Management Module

- Introduced a new module for managing user groups (`usrgrp`) in the administration interface.
- Implemented CRUD operations for user groups: list, create, rename, and delete.
- Added authorization checks to ensure only users with appropriate permissions can manage groups.
- Created corresponding frontend JavaScript and SCSS files for the new module.
- Updated documentation to reflect the new group management functionality and its authorization model.
- Added SQL stored procedures for group management operations.
- Established a new login script for database access, ensuring proper security practices.

Fuchs/wwwroot/web/fis.js

@@ -2845,6 +2845,7 @@ $.extend($t, {
     , m_admin: 'Administration'
     , m_admin_status: 'Systemüberwachung'
     , m_usr: 'Benutzerverwaltung'
+    , m_usrgrp: 'Gruppenverwaltung'
     , rsp: 'Passwort ändern'
     , pnm: 'Die Passwörter stimmen nicht überein'
     , cps: 'Das neue Passwort wurde gespeichert.'
@@ -3241,10 +3242,10 @@ $fis.draft = {
 })();
 
 /* "Administration" is a single sidemenu dropdown (ocmsmenu supports nested items via `itm`)
-   containing two buttons — Benutzerverwaltung (fn=usr) and Systemüberwachung (fn=admin) — both
-   restricted to users whose fds_sys authorization exceeds 4. One auth check gates the whole
-   dropdown; it (and therefore both module scripts) is only added after that check resolves, so
-   lower-privileged users never see it or fetch either module's code.
+   containing three buttons — Benutzerverwaltung (fn=usr), Gruppenverwaltung (fn=usrgrp) and
+   Systemüberwachung (fn=admin) — all restricted to users whose fds_sys authorization exceeds 4.
+   One auth check gates the whole dropdown; it (and therefore all module scripts) is only added
+   after that check resolves, so lower-privileged users never see it or fetch any module's code.
    Called from fis_main_go.js once the DOM (and the initial main menu) is ready. */
 $fis.addAdminMenuButtonsIfAuthorized = function () {
     if ($('#m_admin_grp').length > 0) { return; }   // idempotent
@@ -3254,6 +3255,7 @@ $fis.addAdminMenuButtonsIfAuthorized = function () {
                 lbl: $t.m_admin, id: 'm_admin_grp', ico: 'glyphicon glyphicon-cog',
                 itm: [
                     { lbl: $t.m_usr, id: 'm_usr', fnc: 'init:usr', ico: 'glyphicon glyphicon-user' },
+                    { lbl: $t.m_usrgrp, id: 'm_usrgrp', fnc: 'init:usrgrp', ico: 'glyphicon glyphicon-list' },
                     { lbl: $t.m_admin_status, id: 'm_admin', fnc: 'init:admin', ico: 'glyphicon glyphicon-dashboard' }
                 ]
             });