Following the removal of the last built-in Python plugin (wss-proxy) in PR #8080, the Dockerfile now contains obsolete Python-specific build logic. While the initial changes were merged as an interim solution, a full refactor is necessary to streamline the build process and improve maintainability.

Tasks:

• Remove the deprecated builder-python stage.
• Clean up obsolete Python-related dependencies.
• Optimize multi-stage builds where possible.

Acceptance Criteria:

• Dockerfile is streamlined, with no unnecessary layers or legacy Python logic.
• Build performance is maintained or improved.
• Verify that migrated plugins (clnrest & wss-proxy) function correctly after changes.
• Ensure the refactored Dockerfile works across all supported architectures.
• Documentation is updated (if required)

References:

• Follow-up to PR wss-proxy: replaced by a rust version #8080 (removed wss-proxy).
• Renders issue Python dependencies are missing in release binaries #7665 obsolete (legacy Python plugin support).