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/i18n/request.ts

@@ -0,0 +1,14 @@
+import { getRequestConfig } from "next-intl/server";
+import { hasLocale } from "next-intl";
+import { routing } from "./routing";
+
+export default getRequestConfig(async ({ requestLocale }) => {
+  const requested = await requestLocale;
+  const locale = hasLocale(routing.locales, requested)
+    ? requested
+    : routing.defaultLocale;
+  return {
+    locale,
+    messages: (await import(`../messages/${locale}.json`)).default,
+  };
+});

web/koja/src/i18n/routing.ts

@@ -0,0 +1,6 @@
+import { defineRouting } from "next-intl/routing";
+
+export const routing = defineRouting({
+  locales: ["fa", "en"],
+  defaultLocale: "fa",
+});