Rename public discovery app from "finder" to "koja"

Rebrand the public café-discovery app: directories web/finder→web/koja and
docker/finder→docker/koja, plus all service wiring (docker-compose, Caddy
subdomain koja.meezi.ir, env vars KOJA_PORT / NEXT_PUBLIC_KOJA_URL, CI
workflows) and the app's display name (Koja / کجا).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

web/koja/src/middleware.ts

@@ -0,0 +1,9 @@
+import createMiddleware from "next-intl/middleware";
+import { routing } from "./i18n/routing";
+
+export default createMiddleware(routing);
+
+export const config = {
+  // Match all pathnames except Next.js internals and static files
+  matcher: ["/((?!_next|_vercel|.*\\..*).*)"],
+};