fix: Add ajv and ajv-keywords overrides in package.json to resolve compile error under Node 24

build: Add .npmrc with legacy-peer-deps=true to bypass strict peer dependency checks on Vercel

fix: Downgrade date-fns to resolve Vercel npm peer dependency error

build: Remove build-time weight download to fix Hugging Face secret mounting error

docs: Fix colorTo metadata in README.md

docs: Add Hugging Face Space metadata to README.md

feat: Migrate NeuroScope v2 to Firebase and Google Gemini Explainer