This PR refactors the API mode to use the same configuration loading mechanism as CMD mode, removing the legacy TSConfig parameter support as requested.

Changes Made

IPC Protocol Update

• Replaced TSConfig field with Config field in LintRequest struct
• The API now accepts a path to a rslint.json configuration file instead of a direct tsconfig path

Configuration Unification

• Updated HandleLint function in API mode to use the same configuration loading logic as CMD mode
• Removed duplicate configuration handling code between API and CMD modes
• API mode now uses rslintconfig.LoadConfigLoader to load rslint.json files and extract TypeScript config paths

Multi-Project Support

• API mode now supports multiple TypeScript projects as specified in languageOptions.parserOptions.project array
• Proper rule configuration support based on the rslint.json file instead of enabling all rules by default

TypeScript Service Update

• Updated Node.js service interface to use config parameter instead of tsconfig
• Maintained backward compatibility in the service layer while using the new protocol internally

Test Updates

• Updated existing tests to use rslint.json configuration files
• Created appropriate test configuration files for both regular and virtual file scenarios
• All tests pass with the new unified configuration approach

Benefits

• Consistency: Both API and CMD modes now use identical configuration loading
• No Code Duplication: Removed duplicate configuration logic
• Proper Rule Configuration: API mode now respects rule configuration from rslint.json
• Multi-Project Support: Support for multiple TypeScript projects in a single configuration
• Maintainability: Single source of truth for configuration handling

Migration

Users of the API mode should update their code to use the config parameter pointing to a rslint.json file instead of the tsconfig parameter:

// Before
await lint({ tsconfig: './tsconfig.json' });

// After  
await lint({ config: './rslint.json' });

The rslint.json file should specify TypeScript configurations in languageOptions.parserOptions.project.

Fixes #78.

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