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

README.md

@@ -41,9 +41,9 @@ full design.
 
 ```bash
 docker compose -f deploy/docker-compose.yml up -d
-# open http://localhost:8080  → Import → "Load reference data" for a populated demo
+# open http://localhost:8760  → Import → "Load reference data" for a populated demo
 # ...or start pre-populated:  METERVAULT_SEED=true docker compose -f deploy/docker-compose.yml up -d
-# API docs at http://localhost:8080/swagger
+# API docs at http://localhost:8760/swagger
 ```
 
 Configuration is via environment variables (`Section__Key` double-underscore mapping), e.g.:
@@ -67,7 +67,7 @@ of an environment variable, resolved at runtime.
 ## Pushing readings (Home Assistant)
 
 ```bash
-curl -X POST http://localhost:8080/api/v1/readings \
+curl -X POST http://localhost:8760/api/v1/readings \
   -H "X-Api-Key: $METERVAULT_API_KEY" -H "Content-Type: application/json" \
   -d '[{"meterId": 1, "time": "2026-01-01T12:00:00Z", "value": 47200}]'
 ```