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/docker-compose.yml

@@ -40,9 +40,9 @@ services:
       #   MeterVault__ApiKeys__0: your-secret-key
       #   MeterVault__AllowAnonymousApi: "true"
     ports:
-      - "${METERVAULT_PORT:-8080}:8080"
+      - "${METERVAULT_PORT:-8760}:8760"
     healthcheck:
-      test: ["CMD-SHELL", "curl -fsS http://localhost:8080/healthz || exit 1"]
+      test: ["CMD-SHELL", "curl -fsS http://localhost:8760/healthz || exit 1"]
       interval: 15s
       timeout: 5s
       retries: 5