Upgrade to libzim 9.8.1 + other dependencies

[benoit74]

Summary

• Bump libzim to 9.8.1 and update Node.js dependencies (axios, node-gyp, node-addon-api, etc.)
• Migrate ESLint config from .eslintrc.cjs to flat config (eslint.config.js), required by the ESLint 10 upgrade — same ruleset, no behavior change
• Fix npm run tsc, which was reporting ~270 errors, almost all from a single missing tsconfig.json "types" entry: TypeScript 6 no longer auto-includes @types/* packages, so Jest globals (describe/it/expect) were invisible. Added "types": ["jest", "node"], plus a few small fixes it then surfaced (missing tqdm type declaration, a non-null assertion in a test, excluding dist/eslint.config.js from the program)
• Add a tsc type-check step to CI so this doesn't regress silently again

Why bumping module to es2022 is safe

tsconfig.json's module only affects tsc type-checking and ts-jest's in-test transpilation — nothing it emits is shipped. The package's dist/index.js/index.d.ts are hand-written files copied verbatim by npm run prepare, and the native addon is built separately via node-gyp. So this setting is invisible to consumers, whether their own project is CommonJS or ESM.

Why not using Typescript 7

typescript is stuck at version 6 because @typescript-eslint/parser does not (yet?) supports version 7.