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>

scripts/prepare-template.sh

@@ -118,15 +118,15 @@ build_docker_images() {
 
     # Build orchestrator
     log_info "Building orchestrator..."
-    docker compose -f docker-compose.gpu.yaml build orchestrator
+    docker compose -f compose.yaml build orchestrator
 
     # Build vLLM
     log_info "Building vLLM..."
-    docker compose -f docker-compose.gpu.yaml build vllm-qwen
+    docker compose -f compose.yaml build vllm-qwen
 
     # Build MusicGen
     log_info "Building MusicGen..."
-    docker compose -f docker-compose.gpu.yaml build musicgen
+    docker compose -f compose.yaml build musicgen
 
     # Pull Flux image (pre-built)
     log_info "Pulling Flux.1 image..."
@@ -196,7 +196,7 @@ validate_installation() {
 
     # Start orchestrator
     log_info "Starting orchestrator for validation..."
-    docker compose -f docker-compose.gpu.yaml up -d orchestrator
+    docker compose -f compose.yaml up -d orchestrator
 
     sleep 10
 
@@ -217,7 +217,7 @@ validate_installation() {
     fi
 
     # Stop orchestrator
-    docker compose -f docker-compose.gpu.yaml down
+    docker compose -f compose.yaml down
 
     log_success "Validation passed"
 }