chore: setup systematic backend testing and tdd policy

fix: analytics calculate cost didn't know about model_id

reafctor: implement async analytics and simplify tutor error handlign

fix: handle None types in analytics token calculation

feat: enhance console logging for analytics and token usage

feat: implement usage statistics and cost logging for Google GenAI

refactor: migrate to Gemini Native Files API and Context Caching

merge: resolve conflict by removing package-lock.json in favor of pnpm

chore: migrate from npm to pnpm

chore: add root package.json for unified dev startup

feat: implement Cognitive Cockpit UI/UX with Bloom Mastery Bar

feat: integrate shadcn/ui

Merge branch 'ci/cd'

Merge branch 'pdf-viewer'

fix: resolve dependency conflicts and minimatch vulnerability