fix(expert): add initialState to store module export

[cstns]

Description

adds the initial state on the expert exported module params to enable clearing state when users log out

Related Issue(s)

closes #6297

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

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.77%. Comparing base (ad29e83) to head (3a35651).
⚠️ Report is 16 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6298      +/-   ##
==========================================
- Coverage   76.80%   76.77%   -0.03%     
==========================================
  Files         386      386              
  Lines       19501    19527      +26     
  Branches     4690     4694       +4     
==========================================
+ Hits        14977    14992      +15     
- Misses       4524     4535      +11     

Flag	Coverage Δ
backend	76.77% <ø> (-0.03%)	⬇️

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