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>

docker-compose.yml

@@ -1,4 +1,4 @@
-# Meezi — main stack (Postgres, Redis, API, Dashboard, Website, Finder)
+# Meezi — main stack (Postgres, Redis, API, Dashboard, Website, Koja)
 #
 # Local dev:
 #   cp .env.example .env
@@ -13,7 +13,7 @@
 # URLs (port-based defaults):
 #   Dashboard  http://SERVER:3101/fa/login
 #   Website    http://SERVER:3010/fa
-#   Finder     http://SERVER:3103/fa
+#   Koja       http://SERVER:3103/fa
 #   API        http://SERVER:5080/swagger
 
 services:
@@ -141,18 +141,18 @@ services:
     ports:
       - "${WEBSITE_PORT:-3010}:3000"
 
-  finder:
+  koja:
     build:
       context: .
-      dockerfile: docker/finder/Dockerfile
+      dockerfile: docker/koja/Dockerfile
       extra_hosts:
         - "mirror:host-gateway"
       args:
         NODE_IMAGE: ${NODE_IMAGE:-docker-mirror.liara.ir/library/node:20-alpine}
         NPM_REGISTRY: ${NPM_REGISTRY:-https://package-mirror.liara.ir/repository/npm/}
         NEXT_PUBLIC_API_URL: ${NEXT_PUBLIC_API_URL:-http://localhost:5080}
-        NEXT_PUBLIC_SITE_URL: ${NEXT_PUBLIC_FINDER_URL:-http://localhost:3103}
-    container_name: meezi-finder
+        NEXT_PUBLIC_SITE_URL: ${NEXT_PUBLIC_KOJA_URL:-http://localhost:3103}
+    container_name: meezi-koja
     restart: unless-stopped
     depends_on:
       api:
@@ -161,9 +161,9 @@ services:
       PORT: "3000"
       HOSTNAME: 0.0.0.0
       NEXT_PUBLIC_API_URL: "${NEXT_PUBLIC_API_URL:-http://localhost:5080}"
-      NEXT_PUBLIC_SITE_URL: "${NEXT_PUBLIC_FINDER_URL:-http://localhost:3103}"
+      NEXT_PUBLIC_SITE_URL: "${NEXT_PUBLIC_KOJA_URL:-http://localhost:3103}"
     ports:
-      - "${FINDER_PORT:-3103}:3000"
+      - "${KOJA_PORT:-3103}:3000"
 
 volumes:
   postgres_data: