final changes

feat: Complete Stripe integration, dashboard analytics, and coding challenges

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made the interview running

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feat: Implement real-time dashboard with complete authentication system

Migrate from Clerk to Google OAuth and Ollama chatbot

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fixed integration issues

chore(root): add start/dev scripts; fix(video): validate interviewId to avoid CastError

fix(readiness): return structured service objects to prevent false degraded toasts

chore(chatbot): add diagnostics & validation in health endpoint + client retry logic

fix(chatbot): stabilize streaming (disable compression for SSE, add heartbeat pings) and enhance answer validation UI