docs: add comprehensive CODE_DOCUMENTATION.md

[CasperGamingOne]

Created a new CODE_DOCUMENTATION.md file in the root directory. This file contains a highly detailed description of every class, its properties, and every method (including its internal logic and flow), grouped by architectural layers (Core, Services, UI, Text) to provide a complete understanding of the system's structure and execution.

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PR created automatically by Jules for task 12597496210185014250 started by @CasperGamingOne

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[github-actions]

Qodana Community for .NET

100 new problems were found

Inspection name	Severity	Problems
Method return value is never used: Private accessibility	🔶 Warning	1
Unused local variable	🔶 Warning	1
Type member is never used: Non-private accessibility	◽️ Notice	66
Member can be made private: Non-private accessibility	◽️ Notice	14
Auto-property can be made get-only: Non-private accessibility	◽️ Notice	5
Type member is never accessed via base type: Non-private accessibility	◽️ Notice	5
Merge null/pattern checks into complex pattern	◽️ Notice	2
Unused parameter: Non-private accessibility	◽️ Notice	2
'if' statement can be rewritten as '?:' expression	◽️ Notice	1
Property can be made init-only: Non-private accessibility	◽️ Notice	1
Replace with 'field' keyword	◽️ Notice	1
Simplify LINQ expression (use 'All')	◽️ Notice	1

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