Raise solution description limit to 600 characters

[PavlosIsaris]

Summary

A client asked why solutions are capped at 400 characters while problems allow 600. There is no technical reason: the description column on solution_translations is a text column, and the server already accepted 600 characters on create. The 400 limit lived only in the two forms, and the backoffice update rule allowed 410.

This PR sets the solution description limit to 600 everywhere, matching problems:

• resources/views/solution/partials/new-solution-form.blade.php: maxlength, character counter and label now use 600.
• resources/views/backoffice/management/solution/create-edit/partials/basic-details.blade.php: maxlength now 600.
• app/Http/Controllers/Solution/SolutionController.php: backoffice update rule changed from max:410 to max:600. The store and userProposalStore rules already used 600.

Three feature tests cover the 600/601 boundary on the public proposal store and the backoffice update.

This branch is based on production and contains only this change. The same commit is cherry-picked to master in a separate PR.

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud