Add X-OpenPLC-Runtime-Version header to all API responses

[devin-ai-integration]

Summary

Adds an after_request hook to the REST API blueprint that includes the X-OpenPLC-Runtime-Version header with value v4 in all API responses. This enables the OpenPLC Editor to detect which runtime version it is connecting to and show an error if there is a version mismatch between the selected target (v3 vs v4) and the actual runtime.

This is part of a coordinated change across three repositories:

• OpenPLC_v3 - adds v3 header (PR Rtop 70 implement command logs #7)
• openplc-runtime (this PR) - adds v4 header
• openplc-editor - will read the header and validate version match

The diff also includes minor cleanup from pre-commit hooks: removed unused LogParser import, removed unused exception variable e, and import reordering.

Review & Testing Checklist for Human

• Verify the header X-OpenPLC-Runtime-Version: v4 appears on API responses by running the runtime and testing with curl:

  curl -v -k https://localhost:8443/api/get-users-info 2>&1 | grep -i "x-openplc"

• Confirm the header appears on both 200 and 404 responses (e.g., when no users exist vs when users exist)
• Verify the pre-commit cleanup (removing unused LogParser import and unused e variable) doesn't affect any other code paths

Notes

• Link to Devin run: https://app.devin.ai/sessions/254e4c8fb35044d5bef6ecd2f53d7d60
• Requested by: Thiago Alves (@thiagoralves)

[devin-ai-integration]

🤖 Devin AI Engineer

I'll be helping with this pull request! Here's what you should know:

✅ I will automatically:

• Address comments on this PR. Add '(aside)' to your comment to have me ignore it.
• Look at CI failures and help fix them

Note: I can only respond to comments from users who have write access to this repository.

⚙️ Control Options:

• Disable automatic comment and CI monitoring

[Copilot]

Pull request overview

This PR adds version detection capability to the OpenPLC v4 runtime API by injecting an X-OpenPLC-Runtime-Version: v4 header into all API responses. This allows the OpenPLC Editor to verify it's connecting to the correct runtime version and alert users about version mismatches. The change also includes automated code cleanup from pre-commit hooks, including import reordering, removal of an unused LogParser import, removal of an unused exception variable, and code formatting adjustments.

Key changes:

• Added after_request hook to inject version header into all API responses
• Removed unused imports and variables flagged by pre-commit tools
• Minor formatting improvements to existing code

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.