fix: add Database env vars to api service in docker-compose

api now registers MyAiDbContext for template loading and needs
Database__* connection string vars like the other DB-connected services.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

docker-compose/docker-compose.yml

@@ -110,6 +110,13 @@ services:
       - ASPNETCORE_URLS=${ASPNETCORE_URLS:-http://+:8080}
       - APP_ENVIRONMENT_NAME=${APP_ENVIRONMENT_NAME:-myai.staging}
 
+      - Database__Host=${Database__Host:-sqlserver}
+      - Database__Port=${Database__Port:-1433}
+      - Database__Name=${Database__Name:-MyAiDb}
+      - Database__User=${Database__User:-sa}
+      - Database__Password=${Database__Password:-}
+      - Database__TrustServerCertificate=${Database__TrustServerCertificate:-true}
+
       - Google__TagManagerId=${Google__TagManagerId:-}
       - Google__MapKey=${Google__MapKey:-}