chore: relocate servers exception definition to exception.py for clarity

[LVivona]

This change separates the custom exception definition from the config_parser module. It improves code organization and aligns with single-responsibility principles by moving exception-related logic to its own exception.py file, making both modules easier to maintain and extend.

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PR Type

[x] Refactor
[ ] Feature
[ ] Fix
[ ] Documentation
[ ] Other

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Short Description

Refactored code by relocating exception handling from config_parser.py to a new module exception.py.

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ClickUp Ticket(s)

N/A

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Tests Added

• No new tests added; existing functionality preserved.
• Exception import paths updated where necessary.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.13%. Comparing base (484049c) to head (fe42fa4).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #210   +/-   ##
=======================================
  Coverage   93.13%   93.13%           
=======================================
  Files          32       33    +1     
  Lines        3596     3597    +1     
  Branches      184      263   +79     
=======================================
+ Hits         3349     3350    +1     
  Misses        247      247           

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