[FEATURE] Add Spotify 429 Rate Limit Handling (Exponential Backoff Retries)

[s0s0physm]

Is your feature request related to a problem? Please describe. Spotify API calls has been hitting rate limits and returning 429 Too Many Requests, causing failed actions. Spotify uses a rolling 30-second window and appears to limit ~100 requests/hour per user token and ~25 requests/second per app token; exceeding these denies requests until reset.

Describe the solution you'd like Add 429 handling with capped exponential backoff retries, respecting Retry-After when available.

Do you have a workaround? We've requested rate limit increases, this this doesn’t scale. We need a built-in retry/backoff approach.

Additional context https://developer.spotify.com/documentation/web-api/concepts/rate-limits