[Backend Release] v0.50.0

[deploystack-automation]

Backend Release v0.50.0

This PR prepares a new backend release.

When merged, this will:

1. Create a release tag
2. Build and publish a multi-architecture Docker image to Docker Hub

The Docker image will be available at:

• deploystack/backend:latest
• deploystack/backend:v0.50.0

Supported Architectures

• linux/amd64 (Intel/AMD)
• linux/arm64 (Apple Silicon, AWS Graviton)

Release notes:

• feat(backend): add user-level HTTP config overrides for headers and query params (7193e89d)
• fix(backend): set default value for DEPLOYSTACK_ENCRYPTION_SECRET (8359fc3b)
• feat(all): add real-time MCP server config updates with automatic stdio restart (ad287e4c)

[deploystack-automation]

Release Branch Cleanup ✅

Branch backend-release has been automatically deleted after PR was merged.