Superlog onboarding

Wire OpenTelemetry traces, logs, and metrics into the user's project so telemetry streams to Superlog. Cover every app and service in the repo — not just the one the user is currently sitting in.

Prefer native OpenTelemetry APIs and the framework's documented bootstrap over custom helper layers. If a specific stack stumps you, search the OTel docs for that language; don't guess.

Before editing, read the applicable companion skills:

• otel-onboarding-style for general OTel taste.
• otel-python-style for Python services.
• otel-fastapi-style for FastAPI services.
• otel-livekit-style for LiveKit agents.
• otel-nextjs-style for Next.js/Vercel apps.
• otel-expo-style for Expo / React Native apps.
• otel-supabase-edge-style for Supabase Edge Functions.
• otel-generic-style for any other language (Go, Java/Kotlin, Ruby, Rust, .NET/C#, PHP, Elixir, plain Node, …) — use this as the fallback when none of the above match.

Step 0 — Endpoint and public token handling