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>

.env.example

@@ -24,7 +24,7 @@ JWT_KEY=change-me-64-char-random-string-use-openssl-rand-hex-32-output
 NEXT_PUBLIC_API_URL=http://171.22.25.73:5080
 NEXT_PUBLIC_ADMIN_API_URL=http://171.22.25.73:5081
 NEXT_PUBLIC_SITE_URL=http://171.22.25.73:3010
-NEXT_PUBLIC_FINDER_URL=http://171.22.25.73:3103
+NEXT_PUBLIC_KOJA_URL=http://171.22.25.73:3103
 
 APP_QR_BASE_URL=http://171.22.25.73:3101
 BILLING_DASHBOARD_URL=http://171.22.25.73:3101
@@ -40,7 +40,7 @@ ADMIN_API_PORT=5081
 WEB_PORT=3101
 ADMIN_WEB_PORT=3102
 WEBSITE_PORT=3010
-FINDER_PORT=3103
+KOJA_PORT=3103
 POSTGRES_PORT=5434
 REDIS_PORT=6381
 
@@ -51,19 +51,19 @@ REDIS_PORT=6381
 # NEXT_PUBLIC_API_URL=https://api.meezi.ir
 # NEXT_PUBLIC_ADMIN_API_URL=https://admin-api.meezi.ir
 # NEXT_PUBLIC_SITE_URL=https://meezi.ir
-# NEXT_PUBLIC_FINDER_URL=https://finder.meezi.ir
+# NEXT_PUBLIC_KOJA_URL=https://koja.meezi.ir
 #
 # APP_QR_BASE_URL=https://app.meezi.ir
 # BILLING_DASHBOARD_URL=https://app.meezi.ir
 #
 # CORS_ORIGIN_0=https://app.meezi.ir
 # CORS_ORIGIN_1=https://meezi.ir
-# CORS_ORIGIN_2=https://finder.meezi.ir
+# CORS_ORIGIN_2=https://koja.meezi.ir
 # CORS_ADMIN_ORIGIN_0=https://admin.meezi.ir
 #
 # Then run CI once to rebuild images with the new URLs baked in.
 # DNS required: meezi.ir, app.meezi.ir, api.meezi.ir,
-#               finder.meezi.ir, admin.meezi.ir, admin-api.meezi.ir → server IP
+#               koja.meezi.ir, admin.meezi.ir, admin-api.meezi.ir → server IP
 
 # ── Migrations ────────────────────────────────────────────────────────────────
 RUN_MIGRATIONS=true