feature: add source map support for Go to Definition navigation

[joshmanders]

Summary

Add source mapping support to enable "Go to Definition" navigation from generated TypeScript types back to the original PHP source files. (closes #8)

Features

• Generate .d.ts.map source map files for each enum and resource type
• Add JSDoc @see comments with PHP file references for hover documentation
• Track source locations (file, line, column) during PHP AST parsing
• Support field-level precision for navigating to specific properties

Changes

• Source Map Utility: New VLQ encoder and source map generator (src/utils/source-map.ts)
• PHP Parser: Enable AST position tracking and capture source locations for enums, enum cases, and resource fields
• Enum Generator: Generate individual .d.ts, .d.ts.map, and .js files with JSDoc comments
• Resource Generator: Generate individual .d.ts, .d.ts.map, and .js files with JSDoc comments
• File Utility: Clean up .d.ts.map files during regeneration
• Deprecated Functions Removed: Removed generateEnumTypeScript, generateEnumRuntime, and generateResourceTypeScript in favor of single-file generation functions

Generated Output Example

// UserResource.d.ts
/** @see app/Http/Resources/UserResource.php */
export type UserResource = {
    id: string;
    name: string;
    email: string;
};
//# sourceMappingURL=UserResource.d.ts.map

Test Plan

• All 115 tests pass
• Source map VLQ encoding tests
• PHP parser source location tracking tests
• Enum and resource generator tests with exact output matching