refactor(core): extract prod feature in tabby crate

[wsxiaoys]

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 9 lines in your changes are missing coverage. Please review.

Project coverage is 53.08%. Comparing base (ed25f4a) to head (04b1991).
Report is 2 commits behind head on main.

Files	Patch %	Lines
crates/tabby/src/main.rs	0.00%	3 Missing ⚠️
ee/tabby-db/src/lib.rs	0.00%	3 Missing ⚠️
ee/tabby-webserver/src/handler.rs	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1797      +/-   ##
==========================================
- Coverage   53.10%   53.08%   -0.02%     
==========================================
  Files         121      121              
  Lines       10476    10479       +3     
==========================================
  Hits         5563     5563              
- Misses       4913     4916       +3     

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