feat: Add user management APIs, status enum, enhanced notifications

- Add updateUser and resetUserPassword admin endpoints
- Change company status from boolean to enum (registered, lead, customer, inactive)
- Add 'important' event type to calendar validators and email templates
- Add 1-hour-before event notifications cron job
- Add 18:00 evening notifications for next-day events
- Add contact description field support
- Fix count() function usage in admin service
- Add SQL migrations for schema changes

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/controllers/admin.controller.js

@@ -125,6 +125,47 @@ export const changeUserRole = async (req, res, next) => {
   }
 };
 
+/**
+ * Update user details (admin only)
+ * PATCH /api/admin/users/:userId
+ */
+export const updateUser = async (req, res, next) => {
+  const { userId } = req.params;
+  const { firstName, lastName } = req.body;
+
+  try {
+    const updated = await adminService.updateUser(userId, { firstName, lastName });
+
+    res.status(200).json({
+      success: true,
+      data: updated,
+      message: 'Používateľ bol aktualizovaný',
+    });
+  } catch (error) {
+    next(error);
+  }
+};
+
+/**
+ * Reset user password (admin only)
+ * POST /api/admin/users/:userId/reset-password
+ */
+export const resetUserPassword = async (req, res, next) => {
+  const { userId } = req.params;
+
+  try {
+    const result = await adminService.resetUserPassword(userId);
+
+    res.status(200).json({
+      success: true,
+      data: { tempPassword: result.tempPassword },
+      message: 'Heslo bolo resetované',
+    });
+  } catch (error) {
+    next(error);
+  }
+};
+
 /**
  * Zmazanie usera (admin only)
  * DELETE /api/admin/users/:userId