Store device nodejs version

[hardillb]

fixes #7551

Description

Adds nodejsVersion to Device table

Uses this to pick the correct default snapshot Node-RED version

paired with FlowFuse/device-agent#657

Related Issue(s)

#7551

Checklist

• I have read the contribution guidelines
• Suitable unit/system level tests have been added and they pass
• Documentation has been updated
  • Upgrade instructions
  • Configuration details
  • Concepts
• Changes flowforge.yml?
  • Issue/PR raised on FlowFuse/helm to update ConfigMap Template
  • Issue/PR raised on FlowFuse/CloudProject to update values for Staging/Production
• Link to Changelog Entry PR, or note why one is not needed.

Labels

• Includes a DB migration? -> add the area:migration label

[codecov]

Codecov Report

❌ Patch coverage is 81.81818% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 76.95%. Comparing base (fab5b55) to head (ca89146).

Files with missing lines	Patch %	Lines
forge/db/controllers/Device.js	50.00%	1 Missing ⚠️
...db/migrations/20260622-01-add-device-nodejs-ver.js	80.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7577   +/-   ##
=======================================
  Coverage   76.95%   76.95%           
=======================================
  Files         410      411    +1     
  Lines       21002    21012   +10     
  Branches     5117     5120    +3     
=======================================
+ Hits        16162    16170    +8     
- Misses       4840     4842    +2     

Flag	Coverage Δ
backend	76.95% <81.81%> (+<0.01%)	⬆️

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[hardillb]

WARNING

PR with db migration, need to check which is merged first
#7580