feat: implement JWT-based authentication system with repository, service, and middleware layers

app/Shared/Security/AuthContext.php

@@ -0,0 +1,26 @@
+<?php
+namespace WorkbloomERP\Security;
+
+class AuthContext {
+    private static ?array $user = null;
+
+    public static function setUser(array $user): void {
+        self::$user = $user;
+    }
+
+    public static function getUser(): ?array {
+        return self::$user;
+    }
+
+    public static function getUserId(): ?int {
+        return isset(self::$user['id']) ? (int)self::$user['id'] : null;
+    }
+
+    public static function getUserUuid(): ?string {
+        return self::$user['sub'] ?? self::$user['uuid'] ?? null;
+    }
+
+    public static function clear(): void {
+        self::$user = null;
+    }
+}