Unify server, persist ratings via API, refresh scraper data

- Replace split setup (ratings_server.py on :8081 + http.server on :8080)
  with a single combined Flask server (server.py) on :8080 that serves
  static files and the /api/ratings GET/POST endpoints
- Ratings are now persisted server-side: mapa_bytu.html loads ratings
  from GET /api/ratings on startup (API as source of truth) and POSTs
  on every change — enables cross-browser and cross-device state sharing
  while keeping localStorage as a synchronous read cache
- Dockerfile: install flask, copy server.py instead of ratings_server.py,
  expose only port 8080
- entrypoint.sh: start single server process instead of two
- Makefile: add serve / serve-debug targets for local development
- scrape_psn.py: fix log label, add --max-pages stub arg for CLI parity
- Refresh all scraped property data

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

build/Dockerfile

@@ -6,11 +6,13 @@ RUN apk add --no-cache curl bash tzdata \
 
 ENV PYTHONUNBUFFERED=1
 
+RUN pip install --no-cache-dir flask
+
 WORKDIR /app
 
 COPY scrape_and_map.py scrape_realingo.py scrape_bezrealitky.py \
      scrape_idnes.py scrape_psn.py scrape_cityhome.py \
-     merge_and_map.py regen_map.py run_all.sh ratings_server.py ./
+     merge_and_map.py regen_map.py run_all.sh server.py ./
 
 COPY build/crontab /etc/crontabs/root
 COPY build/entrypoint.sh /entrypoint.sh
@@ -18,7 +20,7 @@ RUN chmod +x /entrypoint.sh run_all.sh
 
 RUN mkdir -p /app/data
 
-EXPOSE 8080 8081
+EXPOSE 8080
 
 HEALTHCHECK --interval=60s --timeout=5s --start-period=300s \
     CMD wget -q -O /dev/null http://localhost:8080/ || exit 1