Migrate linting from ESLint to Oxlint (Fixes #5690)

Replace the primary lint pipeline with oxlint and oxlint-tsgolint for type-aware TypeScript rules, preserving existing rule behavior from eslint.config.mjs via @oxlint/migrate and targeted jsPlugins (@stylistic/eslint-plugin, eslint-plugin-jsdoc as jsdoc-js, oxlint-plugin-eslint for no-restricted-syntax and object-curly-spacing).

Keep a hybrid ESLint pass (eslint.config.naming.mjs) only for @typescript-eslint/naming-convention until tsgolint implements it (oxc-project/tsgolint#186). Legacy eslint.config.mjs and eslint.config.typings.mjs remain for reference but are no longer used by npm scripts.

Add .oxlintrc.json for src/addons/demo/test and .oxlintrc.typings.json for typings/ (syntax-only, no --type-aware). Update lint, lint-fix, lint-api, and lint-changes to run oxlint first, then naming ESLint. Platform binaries install via oxlint-tsgolint optionalDependencies on Linux, macOS, and Windows.

Fixes https://github.com/xtermjs/xterm.js/issues/5690

Co-authored-by: Cursor <cursoragent@cursor.com>

addons/addon-webgl/src/customGlyphs/CustomGlyphDefinitions.ts

@@ -5,7 +5,7 @@
 
 import { CustomGlyphDefinitionType, CustomGlyphScaleType, CustomGlyphVectorType, type CustomGlyphCharacterDefinition, type CustomGlyphDefinitionPart, type CustomGlyphPathDrawFunctionDefinition } from './Types';
 
-/* eslint-disable max-len */
+/* oxlint-disable @stylistic/max-len -- generated glyph path data */
 
 const enum Shapes {
   /** │ */ TOP_TO_BOTTOM = 'M.5,0 L.5,1',