feat: update support agent initial sentence

[andypalmi]

Description

Changed support agent initial sentence to be aligned to the newest FlowFuse expert capabilities.

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

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.52%. Comparing base (d4ae183) to head (5eeb9b4).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7349   +/-   ##
=======================================
  Coverage   76.52%   76.52%           
=======================================
  Files         405      405           
  Lines       20631    20631           
  Branches     4991     4991           
=======================================
  Hits        15788    15788           
  Misses       4843     4843           

Flag	Coverage Δ
backend	76.52% <ø> (ø)

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