feat(core): add Electron runtime, services, and app composition

src/config/warnings.ts

@@ -0,0 +1,19 @@
+import { ConfigValidationWarning } from '../types';
+
+export interface WarningCollector {
+  warnings: ConfigValidationWarning[];
+  warn(path: string, value: unknown, fallback: unknown, message: string): void;
+}
+
+export function createWarningCollector(): WarningCollector {
+  const warnings: ConfigValidationWarning[] = [];
+  const warn = (path: string, value: unknown, fallback: unknown, message: string): void => {
+    warnings.push({
+      path,
+      value,
+      fallback,
+      message,
+    });
+  };
+  return { warnings, warn };
+}