fix: o namespace routing refinement

Closes #568839 (closed)

Changes

This MR fixes the bug where usernames starting with o. (like o.redka and o.kosatka) were returning 404 errors instead of displaying user profile pages.

Root Cause

The /o route for organizations index was incorrectly matching usernames like o.redka because Rails was interpreting the period (.) as a format separator, treating /o.redka as the /o route with format: 'redka'.

Solution

1. Fixed route definition in config/routes/organizations.rb:

• Added format: false constraint to the /o route
• This prevents Rails from treating periods as format separators
• Ensures the /o route only matches exactly /o without any suffix

2. Added test coverage:

• Test to verify /o.json does not route to organizations index
• Test to verify usernames starting with o. (like o.redka) routes to the user profile

Impact

• User profiles for usernames starting with o. will now correctly route to user profile pages
• The /o organizations index route continues to work as expected