fix: replace eslint-plugin-github with typescript-eslint for ESLint 10 compatibility

[Copilot]

eslint-plugin-github@6.0.0 (latest) declares peerDependencies: eslint@"^8 || ^9", making it incompatible with ESLint 10 and causing npm ci to fail with ERESOLVE.

Changes

• Remove eslint-plugin-github — no version supports ESLint 10
• Add typescript-eslint@^8.57.2 (unified package, supports ESLint ^8 || ^9 || ^10) as a direct replacement for the TypeScript flat config
• Add globals@^17.4.0 as a direct dependency (was a transitive dep via eslint-plugin-github)
• Update eslint.config.mjs — replace github.getFlatConfigs().typescript with tseslint.config(...tseslint.configs.recommended, ...)

-import github from "eslint-plugin-github";
+import tseslint from "typescript-eslint";

-export default [{
-    ignores: [...],
-}, ...github.getFlatConfigs().typescript, {
+export default tseslint.config({
+    ignores: [...],
+}, ...tseslint.configs.recommended, {
     // project-specific rules unchanged
-}];
+});

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[tgodzik]

Looks good, the other plugin indeed doesn't support esling 10