refactor: move login.html into a login component

[fmartingr]

Changes

• Removed separate login page and route, integrating login functionality into the main SPA
• Modified login component to match original design using Vue directives
• Updated state management for login/main view visibility using v-if/v-else-if
• Removed server-side version injection, replacing with API-based version fetching
• Fixed logout functionality to show login form without page redirect

Technical Details

1. Removed /login route from internal/http/routes/frontend.go
2. Updated login component template in internal/view/assets/js/component/login.js:
3. Modified internal/view/index.html:
   • Updated login state management
   • Improved logout function to maintain SPA behavior

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 34.66%. Comparing base (617f5dd) to head (234bf1b).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1017      +/-   ##
==========================================
- Coverage   34.74%   34.66%   -0.08%     
==========================================
  Files          61       61              
  Lines        5322     5316       -6     
==========================================
- Hits         1849     1843       -6     
  Misses       3249     3249              
  Partials      224      224              

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