Add SportPath auth APIs and training content foundation

backend/Database.php

@@ -25,8 +25,7 @@ class Database {
             $this->connection->query("SET time_zone = '+00:00'");
         } catch (Throwable $e) {
             error_log('Database initialization failed: ' . $e->getMessage());
-            http_response_code(500);
-            die(json_encode(['error' => 'Database connection failed']));
+            throw new RuntimeException('Database connection failed', 0, $e);
         }
     }
 
@@ -109,6 +108,8 @@ class Database {
 // Prevent cloning
 final class SingletonDatabase extends Database {
     private function __clone() {}
-    private function __wakeup() {}
+    public function __wakeup() {
+        throw new LogicException('Database singleton cannot be unserialized');
+    }
 }
 ?>