refactor: rename docker-compose.gpu.yaml to compose.yaml

Simplified compose file naming to follow Docker Compose best practices:
- Renamed docker-compose.gpu.yaml to compose.yaml
- Updated all references in documentation files (README.md, DEPLOYMENT.md, GPU_DEPLOYMENT_LOG.md, RUNPOD_TEMPLATE.md)
- Updated references in scripts (prepare-template.sh)

This change enables simpler command syntax:
- Before: docker compose -f docker-compose.gpu.yaml up -d orchestrator
- After: docker compose up -d orchestrator

Generated with Claude Code (https://claude.com/claude-code)

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

README.md

@@ -23,7 +23,7 @@ If you've already created a RunPod template:
 1. Deploy pod from template in RunPod dashboard
 2. SSH to the pod
 3. Create `.env` file with your credentials
-4. Start orchestrator: `docker compose -f docker-compose.gpu.yaml up -d orchestrator`
+4. Start orchestrator: `docker compose -f compose.yaml up -d orchestrator`
 
 **See**: [RUNPOD_TEMPLATE.md](RUNPOD_TEMPLATE.md) for template usage instructions.
 
@@ -107,7 +107,7 @@ models:
     endpoint: /v1/chat/completions
 ```
 
-Then add the Docker service to `docker-compose.gpu.yaml` and restart the orchestrator.
+Then add the Docker service to `compose.yaml` and restart the orchestrator.
 
 **See**: [docs/DEPLOYMENT.md](docs/DEPLOYMENT.md#adding-new-models) for complete instructions.