Remove Administrate Gem & Files

[americac]

!!! Blocked By: #946 #973 !!!

Description:
Remove Administrate gem and all related files after successful namespace migration.

Tasks:

• Remove administrate from Gemfile
• Run bundle install
• Delete /app/dashboards/ directory (13 files)
• Delete /app/fields/portfolio_link.rb
• Delete /app/controllers/admin/application_controller.rb (old Administrate base)
• Delete Administrate views (now replaced by new admin)
• Delete /config/initializers/administrate_assets.rb
• Delete /config/locales/administrate.en.yml
• Delete /app/views/admin/application/_stylesheet.html.erb
• Delete old Administrate view partials
• Remove commented Administrate routes from config/routes.rb
• Run full test suite
• Verify all admin functionality still works
• Update any documentation referencing Administrate

Acceptance Criteria:

• Administrate gem removed from Gemfile
• Bundle install succeeds
• All dashboard files deleted
• All Administrate controllers deleted
• All Administrate views deleted
• Initializer and locale files removed
• No references to Administrate remain in codebase
• Administrate routes removed from routes.rb
• All tests pass
• All admin pages load correctly at /admin/*
• No broken links or errors in admin interface
• No Administrate code remains

Files to Delete:

• Gemfile (line 9 - administrate gem)
• /app/dashboards/ (entire directory)
• /app/fields/portfolio_link.rb
• /app/controllers/admin/application_controller.rb (Administrate base)
• /config/initializers/administrate_assets.rb
• /config/locales/administrate.en.yml
• /app/views/admin/application/_stylesheet.html.erb
• Old Administrate view partials

Files to Update:

• config/routes.rb (remove commented Administrate routes)