Align Expert FF Expert chat and MCP endpoints

[Steve-Mcl]

Description

Align the Expert /chat endpoint the same way /mcp/features already does to a consistent single server-side source of truth.

Related Issue(s)

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 88.88889% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 76.70%. Comparing base (d6d525f) to head (e897303).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
forge/ee/routes/expert/index.js	88.88%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7389      +/-   ##
==========================================
+ Coverage   76.66%   76.70%   +0.03%     
==========================================
  Files         410      410              
  Lines       20874    20888      +14     
  Branches     5066     5067       +1     
==========================================
+ Hits        16004    16022      +18     
+ Misses       4870     4866       -4     

Flag	Coverage Δ
backend	76.70% <88.88%> (+0.03%)	⬆️

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[andypalmi]

Analysed the code, then looked it over together with Steve to discuss a few questions I had about it and I am happy with it.

[andypalmi]

Analysed the code, then looked it over together with Steve to discuss a few questions I had about it and I am happy with it.

[andypalmi]

Analysed the code, then looked it over together with Steve to discuss a few questions I had about it and I am happy with it.