Support latest and greatest `models` root-level feature with Docker Compose

Need to have `score-compose` supporting this, but it would great to have this generated:
```yaml
services:
go-genai:
build:
context: .
dockerfile: Dockerfile
ports:
- "8080:8080"
environment:
- PORT=8080
models:
llama:
endpoint_var: LLM_BASE_URL
model_var: LLM_MODEL_NAME
models:
llama:
model: ai/llama3.2:1B-Q8_0
context_size: 2048
```

Start by locating the score-compose generation entry point and inspecting its existing Docker Compose output. Compare that output with the YAML shown in the issue; done means the generated file includes the requested service-level and root-level models configuration.

Written by the indexing model from the issue text.