Fix runtime directory creation for Windows installer

[devin-ai-integration]

Summary

Fixes the FileNotFoundError: [Errno 2] No such file or directory: '/var/run/runtime/.env' error that occurs when the Windows installer runs for the first time.

The issue was that the runtime directory doesn't exist when the packaged installer runs, unlike manual MSYS2 installations where install.sh creates it. This PR adds a get_runtime_dir() function that:

• Dynamically determines the runtime directory based on platform (/run/runtime on MSYS2/Cygwin, /var/run/runtime on Linux)
• Ensures the directory exists before writing the .env file

Also fixes pre-existing pylint warnings (encoding, sys.exit, too-few-public-methods).

Updates since last revision

• Added Autonomy Logic icon (openplc.ico) downloaded from autonomylogic.com favicon
• Configured installer to use the icon (SetupIconFile, UninstallDisplayIcon)
• Added icon to Start Menu and desktop shortcuts
• Icon is bundled with installation for shortcut references

Review & Testing Checklist for Human

• Test on Windows/MSYS2: Run the installer and verify the runtime starts without FileNotFoundError
• Verify icon appears correctly: Check that the Autonomy Logic icon shows on desktop shortcut, Start Menu shortcuts, and in Add/Remove Programs
• Verify platform detection: The code uses platform.system() != "Linux" which catches ALL non-Linux platforms. Confirm this is the intended behavior for MSYS2 detection
• Verify path consistency: Ensure /run/runtime on MSYS2 matches what install.sh and start_openplc.sh expect
• Test on Linux/Docker: Verify the change doesn't break existing Linux deployments (should still use /var/run/runtime)

Recommended test plan:

1. Build the Windows installer via GitHub Actions
2. Install on a Windows machine
3. Verify the Autonomy Logic icon appears on shortcuts and in the installer
4. Launch OpenPLC Runtime and verify it starts without errors
5. Also test a fresh Docker deployment to ensure Linux behavior is unchanged

Notes

Link to Devin run: https://app.devin.ai/sessions/64ffd9e3ddb84cc08e3e414b5296e07d
Requested by: Thiago Alves (@thiagoralves)

[devin-ai-integration]

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