Enhancement: support dockhand api key auth

[shamoon]

Proposed change

Supersedes #6847
Closes #6633

Type of change

• New service widget
• Bug fix (non-breaking change which fixes an issue)
• New feature or enhancement (non-breaking change which adds functionality)
• Documentation only
• Other (please explain)

Checklist:

• If applicable, I have added corresponding documentation changes.
• If applicable, I have added or updated tests for new features and bug fixes (see testing).
• If applicable, I have reviewed the feature / enhancement and / or service widget guidelines.
• I have checked that all code style checks pass using pre-commit hooks and linting checks.
• If applicable, I have tested my code for new features & regressions on both mobile & desktop devices, using the latest version of major browsers.
• In the description above I have disclosed the use of AI tools in the coding of this PR.

[codecov]

Edit: 059bdd2

Codecov Report

✅ Patch coverage is 100%.
✅ Project coverage is 81.42%. Comparing base (1b02791) to head (d675757).
⚠️ Report is 1 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #6848      +/-   ##
==========================================
- Coverage   81.43%   81.42%   -0.01%     
==========================================
  Files         532      532              
  Lines        9581     9584       +3     
  Branches     1797     1797              
==========================================
+ Hits         7802     7804       +2     
- Misses       1079     1080       +1     
  Partials      700      700              

Flag	Coverage Δ
vitest-shard-1	27.23% <0.00%> (-0.01%)	⬇️
vitest-shard-2	20.95% <75.00%> (+0.01%)	⬆️
vitest-shard-3	27.90% <0.00%> (-0.01%)	⬇️
vitest-shard-4	22.71% <0.00%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
src/widgets/dockhand/proxy.js	82.14% <75.00%> (-1.86%)	⬇️

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