chore: initialize clean metapi repository

src/web/devProxyTarget.ts

@@ -0,0 +1,15 @@
+type ProxyEnv = Record<string, string | undefined>;
+
+function normalizeTarget(raw: string): string {
+  return raw.trim().replace(/\/+$/, '');
+}
+
+export function resolveDevProxyTarget(env: ProxyEnv): string {
+  const explicit = normalizeTarget(env.DEV_PROXY_TARGET || env.VITE_DEV_PROXY_TARGET || '');
+  if (explicit) return explicit;
+
+  const port = (env.PORT || env.VITE_BACKEND_PORT || '').trim();
+  if (port) return `http://localhost:${port}`;
+
+  return 'http://localhost:4000';
+}