feat(crm): add customer follow-up reminders

[nijel]

Track due customer next actions in the CRM so small teams do not lose follow-ups.

[codecov]

Codecov Report

❌ Patch coverage is 96.68050% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.13%. Comparing base (4d2254a) to head (2a4144c).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3997      +/-   ##
==========================================
+ Coverage   88.98%   89.13%   +0.14%     
==========================================
  Files          71       71              
  Lines       11334    11563     +229     
  Branches      979      991      +12     
==========================================
+ Hits        10086    10307     +221     
- Misses        912      915       +3     
- Partials      336      341       +5     

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[chatgpt-codex-connector]

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