Add optional logs link to dashboard

[dereuromark]

Summary

Adds a configurable "Logs" button to the Queue admin dashboard for quick access to application logs.

Configuration

The link is controlled by Log.engine config:

Config Value	Behavior
'db'	Links to DatabaseLog plugin admin (if plugin is loaded)
URL string	Links to external logging service (opens in new tab)
null/unset	No link shown

Usage

// config/app.php

// Option 1: Use DatabaseLog plugin
'Log' => [
    'engine' => 'db',
],

// Option 2: External logging service  
'Log' => [
    'engine' => 'https://your-logging-dashboard.com',
],

Screenshot

The "Logs" button appears in the status banner next to "Manage Workers" when configured.

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.73%. Comparing base (c63f624) to head (ca81cbc).
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Additional details and impacted files

@@            Coverage Diff            @@
##             master     #466   +/-   ##
=========================================
  Coverage     76.73%   76.73%           
  Complexity      926      926           
=========================================
  Files            45       45           
  Lines          3151     3151           
=========================================
  Hits           2418     2418           
  Misses          733      733           

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