release: default to Web UI in Docker image, add HEALTHCHECK and APP_VERSION; CI smoke test; compose docs and dockerhub compose file

dockerhub-docker-compose.yml

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+services:
+  web:
+    image: mwisnowski/mtg-python-deckbuilder:latest
+  # Tip: pin to a specific tag when available, e.g. :2.0.2 (defaults to Web UI)
+    container_name: mtg-deckbuilder-web
+    ports:
+      - "8080:8080"  # Host:Container — open http://localhost:8080
+    environment:
+      # UI features/flags (all optional)
+      - SHOW_LOGS=1           # 1=enable /logs page; 0=hide (default off if unset)
+      - SHOW_DIAGNOSTICS=1    # 1=enable /diagnostics & /diagnostics/perf; 0=hide (default off)
+      - ENABLE_PWA=0          # 1=serve manifest/service worker (experimental); 0=disabled
+      - WEB_VIRTUALIZE=1      # 1=enable list virtualization/lazy tweaks in Web UI; 0=off
+      - WEB_TAG_PARALLEL=1    # 1=parallelize heavy tagging steps in Web UI; 0=serial
+      - WEB_TAG_WORKERS=4     # Worker count for parallel tagging (only used if WEB_TAG_PARALLEL=1)
+
+      # Theming (optional)
+      - THEME=system          # Default theme for first-time visitors: system|light|dark
+                              # 'light' maps to the consolidated Light (Blend) palette
+      - ENABLE_THEMES=1       # 1=show theme selector in header; 0=hide selector
+                              # Note: THEME still applies as the default even if selector is hidden
+
+      # Version label (optional; shown in footer/diagnostics)
+      # - APP_VERSION=v2.0.2
+
+    volumes:
+      # Persist app data locally; ensure these directories exist next to this compose file
+      - ${PWD}/deck_files:/app/deck_files
+      - ${PWD}/logs:/app/logs
+      - ${PWD}/csv_files:/app/csv_files
+      - ${PWD}/config:/app/config
+      - ${PWD}/owned_cards:/app/owned_cards
+
+    restart: unless-stopped