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/koja/Dockerfile

@@ -0,0 +1,39 @@
+ARG NODE_IMAGE=docker-mirror.liara.ir/library/node:20-alpine
+
+FROM ${NODE_IMAGE} AS deps
+WORKDIR /app
+COPY web/koja/package*.json ./
+ARG NPM_REGISTRY=https://package-mirror.liara.ir/repository/npm/
+RUN npm install --legacy-peer-deps --ignore-scripts --registry ${NPM_REGISTRY}
+
+FROM ${NODE_IMAGE} AS builder
+WORKDIR /app
+
+ARG NEXT_PUBLIC_API_URL=http://localhost:5080
+ARG NEXT_PUBLIC_SITE_URL=https://koja.meezi.ir
+ENV NEXT_PUBLIC_API_URL=$NEXT_PUBLIC_API_URL
+ENV NEXT_PUBLIC_SITE_URL=$NEXT_PUBLIC_SITE_URL
+ENV NEXT_TELEMETRY_DISABLED=1
+
+COPY --from=deps /app/node_modules ./node_modules
+COPY web/koja/ .
+RUN npm run build
+
+FROM ${NODE_IMAGE} AS runner
+WORKDIR /app
+
+ENV NODE_ENV=production
+ENV PORT=3000
+ENV HOSTNAME=0.0.0.0
+ENV NEXT_TELEMETRY_DISABLED=1
+
+RUN addgroup --system --gid 1001 nodejs \
+    && adduser --system --uid 1001 nextjs
+
+COPY --from=builder /app/public ./public
+COPY --from=builder --chown=nextjs:nodejs /app/.next/standalone ./
+COPY --from=builder --chown=nextjs:nodejs /app/.next/static ./.next/static
+
+USER nextjs
+EXPOSE 3000
+CMD ["node", "server.js"]