Instrument sanctions' FastAPI app in code

FastAPIInstrumentor.instrument_app gives sanctions its SERVER span back,
skipping /healthz (the Docker healthcheck flooded Tempo search) and the
ASGI receive/send INTERNAL spans. Drop the OTEL_* env vars only the
zero-code configurator read, and the unused SERVICE_NAME.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docker-compose.yml

@@ -141,13 +141,7 @@ services:
       - ./scripts:/app/scripts
     environment:
       <<: *app-env
-      SERVICE_NAME: sanctions
-      OTEL_SERVICE_NAME: sanctions
       OTEL_EXPORTER_OTLP_ENDPOINT: https://otlp.vione.cloud
-      OTEL_EXPORTER_OTLP_PROTOCOL: http/protobuf
-      OTEL_TRACES_EXPORTER: otlp
-      OTEL_METRICS_EXPORTER: none
-      OTEL_LOGS_EXPORTER: none
     env_file:
       - .env.observability
     command: uvicorn services.sanctions.app:app --host 0.0.0.0 --port 8003 --reload --no-access-log