cleanup: remove Docker references from codebase

- Remove host.docker.internal from api-endpoint-tests.yml CI workflow
- Remove Docker build/push commands from production-deploy.sh
- Remove Docker prerequisite checks from deploy.sh
- Remove Docker from CLI deployment instructions
- Remove Docker from marketplace_scaler.py scaling comment
- Remove Docker from agent_security.py sandbox config and comments
- Remove Docker from developer_platform.py skills list
- Remove Dockerfile/docker-compose.yml from final-cleanup.sh output
- Addresses request to remove all Docker support references

cli/commands/deployment.py

@@ -42,9 +42,8 @@ def setup(service, environment):
             "",
             "1. Prerequisites:",
             "   - Python 3.13+",
-            "   - PostgreSQL 14+", 
+            "   - PostgreSQL 14+",
             "   - Redis 6+",
-            "   - Docker (optional)",
             "",
             "2. Environment Setup:",
             "   - Copy .env.example to .env",