Add TOML config file support with array-of-tables format

[aponcedeleonch]

Summary

• Add TOML configuration file format support infrastructure with the array-of-tables ([[section]]) format
• This format is used by clients like Mistral Vibe
• Foundation PR for TOML support - nested tables format will follow in a separate PR

Changes

• Added TOML extension constant and TOMLStorageType type with TOMLStorageTypeArray constant
• Added shared TOML helper functions: tomlWithFileLock, readTOMLConfig, writeTOMLConfig, extractURLFromMCPServer, convertToAnySlice
• Added TOMLConfigUpdater struct and methods for array-of-tables format
• Added helper functions extractServersKeyFromConfig and extractURLLabelFromConfig
• Updated validateConfigFileFormat to support TOML validation
• Updated CreateClientConfig to support TOML file creation
• Updated retrieveConfigFileMetadata to create TOML updaters
• Added comprehensive tests for TOMLConfigUpdater

🤖 Generated with Claude Code

[codecov]

Codecov Report

❌ Patch coverage is 60.78431% with 60 lines in your changes missing coverage. Please review.
✅ Project coverage is 65.50%. Comparing base (ac82979) to head (3fe280b).
⚠️ Report is 22 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/client/config_editor.go	64.10%	28 Missing and 14 partials ⚠️
pkg/client/config.go	46.87%	17 Missing ⚠️
pkg/client/converter.go	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3596      +/-   ##
==========================================
- Coverage   65.51%   65.50%   -0.01%     
==========================================
  Files         406      406              
  Lines       39996    40123     +127     
==========================================
+ Hits        26202    26283      +81     
- Misses      11762    11797      +35     
- Partials     2032     2043      +11     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.