fix: add patient form validation and auth proxy

- Fix dateOfBirth default from empty string to null (caused Invalid date error)
- Add noValidate to form to prevent browser native email validation blocking submit
- Reset form when switching from edit to add mode
- Export API_BASE_URL from queryClient; switch patient table to raw fetch (prevents token wipe on 401)
- Add Authorization header forwarding in Vite proxy (was stripped by nginx Connection:upgrade)
- Make only firstName, lastName, dateOfBirth, phone required; gender optional
- Add +1 prefix to phone number input (stores as 1XXXXXXXXXX)

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

apps/Frontend/src/lib/queryClient.ts

@@ -1,6 +1,6 @@
 import { QueryClient, QueryFunction } from "@tanstack/react-query";
 
-const API_BASE_URL = import.meta.env.VITE_API_BASE_URL_BACKEND ?? "";
+export const API_BASE_URL = import.meta.env.VITE_API_BASE_URL_BACKEND ?? "";
 
 async function throwIfResNotOk(res: Response) {
   if (!res.ok) {