Deploy: change default HTTP port 8080 -> 8760

8080 is a very common, collision-prone port. 8760 (hours in a year) is an uncommon default that also avoids Home Assistant's 8123. Applied across Dockerfile (ASPNETCORE_URLS/EXPOSE), compose (mapping + healthcheck), the Unraid template, README and a code comment. The METERVAULT_PORT host override still works.

Claude-Session: https://claude.ai/code/session_01Kib2MniVFbD95fkgLgBBnB

deploy/Dockerfile

@@ -25,8 +25,8 @@ RUN apt-get update \
     && apt-get install -y --no-install-recommends curl \
     && rm -rf /var/lib/apt/lists/*
 COPY --from=build /app/publish ./
-ENV ASPNETCORE_URLS=http://+:8080 \
+ENV ASPNETCORE_URLS=http://+:8760 \
     ASPNETCORE_ENVIRONMENT=Production \
     DOTNET_SYSTEM_GLOBALIZATION_INVARIANT=false
-EXPOSE 8080
+EXPOSE 8760
 ENTRYPOINT ["dotnet", "MeterVault.App.dll"]