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>

.gitea/workflows/ci-cd.yml

@@ -228,8 +228,8 @@ jobs:
         env:
           MEEZI_API_URL: http://localhost:5080
 
-  finder-check:
-    name: "CI · Finder (tsc)"
+  koja-check:
+    name: "CI · Koja (tsc)"
     runs-on: ubuntu-latest
     container:
       image: 171.22.25.73:5000/library/node:20-alpine
@@ -250,11 +250,11 @@ jobs:
           rm -f /tmp/repo.tar.gz
 
       - name: Install dependencies
-        working-directory: web/finder
+        working-directory: web/koja
         run: npm install --legacy-peer-deps --ignore-scripts --registry http://mirror:8081/repository/npm-group/
 
       - name: TypeScript check
-        working-directory: web/finder
+        working-directory: web/koja
         run: npx tsc --noEmit
         env:
           NEXT_PUBLIC_API_URL: http://localhost:5080
@@ -276,7 +276,7 @@ jobs:
       - dashboard-check
       - admin-web-check
       - website-check
-      - finder-check
+      - koja-check
     if: github.event_name == 'push' && github.ref == 'refs/heads/main'
     timeout-minutes: 40
 
@@ -297,8 +297,8 @@ jobs:
         env:
           ENV_FILE: ${{ secrets.ENV_FILE }}
 
-      - name: Build main images (api, web, website, finder)
-        run: docker compose build --parallel api web website finder
+      - name: Build main images (api, web, website, koja)
+        run: docker compose build --parallel api web website koja
         env:
           DOCKER_BUILDKIT: 1
           COMPOSE_DOCKER_CLI_BUILD: 1
@@ -318,7 +318,7 @@ jobs:
           docker compose up -d \
             --remove-orphans \
             --no-deps \
-            postgres redis api web website finder
+            postgres redis api web website koja
 
       - name: Start admin services
         run: |