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

@@ -2,7 +2,7 @@ ARG NODE_IMAGE=docker-mirror.liara.ir/library/node:20-alpine
 
 FROM ${NODE_IMAGE} AS deps
 WORKDIR /app
-COPY web/finder/package*.json ./
+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}
 
@@ -10,13 +10,13 @@ FROM ${NODE_IMAGE} AS builder
 WORKDIR /app
 
 ARG NEXT_PUBLIC_API_URL=http://localhost:5080
-ARG NEXT_PUBLIC_SITE_URL=https://find.meezi.ir
+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/finder/ .
+COPY web/koja/ .
 RUN npm run build
 
 FROM ${NODE_IMAGE} AS runner