Revert struct field reordering in config types

[Copilot]

The review on PR #707 identified unintended struct field reordering in internal/config/types.go that could affect reflection-based operations and struct initialization without field names.

Changes:

• Restored Config struct field order: OpenVPN before OAuth2
• Restored OpenVPN struct field order: ClientConfig before Bypass

These changes revert the field positions to their original ordering while preserving all functionality added in the profile selector feature.

---

💬 We'd love your input! Share your thoughts on Copilot coding agent in our 2 minute survey.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.48%. Comparing base (b3d3386) to head (59f8960).

Additional details and impacted files

@@                 Coverage Diff                 @@
##           config-selector     #721      +/-   ##
===================================================
+ Coverage            84.42%   84.48%   +0.05%     
===================================================
  Files                   59       59              
  Lines                 3602     3602              
===================================================
+ Hits                  3041     3043       +2     
+ Misses                 389      388       -1     
+ Partials               172      171       -1     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.