feat: add new frontend components, MH batch worker, and gitignore rules

- Add all new Frontend source files (pages, components, hooks, utils)
- Add selenium_MHBatchPaymentCheckWorker.py and MHSinglePaymentCheckWorker.py
- Add install-steps-5-13.sh setup script
- Update .gitignore to exclude runtime/sensitive data (backups, uploads,
  chat-history, keys, downloads, generated .d.ts files) while keeping folders
- Add .gitkeep to preserve empty runtime folders in git

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/Frontend/src/components/appointments/add-appointment-modal.jsx

@@ -0,0 +1,19 @@
+import { Dialog, DialogContent, DialogHeader, DialogTitle, } from "@/components/ui/dialog";
+import { AppointmentForm } from "./appointment-form";
+export function AddAppointmentModal({ open, onOpenChange, onSubmit, onDelete, isLoading, appointment, prefillData, }) {
+    return (<Dialog open={open} onOpenChange={onOpenChange}>
+      <DialogContent className="max-w-md">
+        <DialogHeader>
+          <DialogTitle>
+            {appointment ? "Edit Appointment" : "Add New Appointment"}
+          </DialogTitle>
+        </DialogHeader>
+        <div className="p-1">
+          <AppointmentForm appointment={appointment} prefillData={prefillData} onSubmit={(data) => {
+            onSubmit(data);
+            onOpenChange(false);
+        }} isLoading={isLoading} onDelete={onDelete} onOpenChange={onOpenChange}/>
+        </div>
+      </DialogContent>
+    </Dialog>);
+}