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>

.github/workflows/deploy.yml

@@ -32,7 +32,7 @@ jobs:
         run: |
           docker compose build --parallel \
             --build-arg BUILDKIT_INLINE_CACHE=1 \
-            api web website finder
+            api web website koja
         env:
           DOCKER_BUILDKIT: 1
           COMPOSE_DOCKER_CLI_BUILD: 1
@@ -43,7 +43,7 @@ jobs:
           docker compose up -d \
             --remove-orphans \
             --no-deps \
-            postgres redis api web website finder
+            postgres redis api web website koja
 
       # Wait for API healthcheck before declaring success
       - name: Wait for API health