Revert "feat: remove MCP servers"

This reverts commit a9ff78b494.

docker-compose.yml

@@ -35,6 +35,13 @@ services:
       - HTTPS_PROXY=http://proxy:3128
       - ALL_PROXY=http://proxy:3128
       - NO_PROXY=localhost,127.0.0.1
+      # MCP server credentials — all optional; servers are skipped if unset
+      - GITHUB_TOKEN=${GITHUB_TOKEN:-}
+      - GITLAB_TOKEN=${GITLAB_TOKEN:-}
+      - GITLAB_URL=${GITLAB_URL:-https://gitlab.com}
+      - ATLASSIAN_SITE_NAME=${ATLASSIAN_SITE_NAME:-}
+      - ATLASSIAN_USER_EMAIL=${ATLASSIAN_USER_EMAIL:-}
+      - ATLASSIAN_API_TOKEN=${ATLASSIAN_API_TOKEN:-}
     ports:
       # OAuth callback — required for browser-based login (claude login)
       - "0.0.0.0:54545:54545"