feat: badge versione build in GUI + build.sh con auto-bump

- VERSION (1.0.0) + build.sh: bump patch/minor/major e deploy via docker compose
- Dockerfile: ARG/ENV APP_VERSION + BUILD_TIME (iniettati come build-arg)
- version.build_info(): env in Docker, fallback file VERSION + '(local)' in dev
- GET /api/version; badge #appVersionPill nell'header (tooltip = build time)
- test_version.py: env vs fallback

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Dockerfile

@@ -12,13 +12,20 @@ COPY pyproject.toml README.md ./
 COPY src/ src/
 RUN uv sync --no-dev
 
-COPY config.yaml ./
+COPY config.yaml VERSION ./
 COPY web/ web/
 
 ENV PRESA_MANO_CONFIG=/app/config.yaml
 ENV PRESA_MANO_DATA=/app/data
 ENV PRESA_MANO_PORT=8890
 
+# Versione build: iniettata da build.sh come --build-arg. Cambia ad ogni build
+# (il valore diverso invalida solo questi due layer finali, non le dipendenze).
+ARG APP_VERSION=dev
+ARG BUILD_TIME=unknown
+ENV APP_VERSION=${APP_VERSION}
+ENV BUILD_TIME=${BUILD_TIME}
+
 EXPOSE 8890
 
 # Shell form so $PRESA_MANO_PORT viene espanso a runtime: cambi la porta in