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>

docs/GPU_DEPLOYMENT_LOG.md

@@ -260,7 +260,7 @@ models:
 ### Deployment Changes
 
 #### Docker Compose Structure
-- **File**: `docker-compose.gpu.yaml`
+- **File**: `compose.yaml`
 - **Services**: 4 total (1 orchestrator + 3 models)
 - **Profiles**: `text`, `image`, `audio` (orchestrator manages activation)
 - **Restart Policy**: `no` for models (orchestrator controls lifecycle)
@@ -319,7 +319,7 @@ ssh gpu-pivoine
 cd /workspace/ai/
 
 # Start orchestrator (manages everything)
-docker compose -f docker-compose.gpu.yaml up -d orchestrator
+docker compose -f compose.yaml up -d orchestrator
 
 # Check status
 curl http://100.100.108.13:9000/health