Reorganize into monorepo layout, move mitarbeiter-app to legacy reference

Consolidates the previously separate omsorgapp and omsorgCore repos
(each had their own nested .git with GitHub history) plus the old
root-level website/mitarbeiter-app into a single monorepo, matching
the structure already documented in the root CLAUDE.md. Also moves
the PHP employee app aside as omsorgWeb/mitarbeiter-app-legacy/ to
serve as a template for a ground-up rewrite.

Fixes .gitignore in the same pass: the config-secrets/uploads/data
patterns were unanchored (relative to repo root, not depth-agnostic),
so they silently stopped matching once the app moved under omsorgWeb/.
Patterns are now **/-prefixed and cover both mitarbeiter-app and
mitarbeiter-app-legacy, keeping DB/SMTP credentials and uploaded
employee documents out of version control.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

omsorgapp/src/components/Header.jsx

@@ -0,0 +1,52 @@
+import { Bell, LogOut, Search, UserCircle2 } from "lucide-react";
+import { useAuth } from "../app/AuthContext";
+
+export default function Header() {
+  const { user, logout } = useAuth();
+
+  return (
+    <header className="header">
+
+      <div className="header-left">
+
+        <h1>Guten Morgen Sabina & Malik ☀️</h1>
+
+        <p>
+          Schön, dass ihr heute wieder da seid.
+        </p>
+
+      </div>
+
+      <div className="header-right">
+
+        <button className="icon-button">
+          <Search size={20} />
+        </button>
+
+        <button className="icon-button notification">
+
+          <Bell size={20} />
+
+          <span className="notification-dot">
+            3
+          </span>
+
+        </button>
+
+        <button className="icon-button">
+          <UserCircle2 size={24} />
+        </button>
+
+        {user?.username && (
+          <span className="header-username">{user.username}</span>
+        )}
+
+        <button className="icon-button" title="Abmelden" onClick={logout}>
+          <LogOut size={20} />
+        </button>
+
+      </div>
+
+    </header>
+  );
+}