GateIO rate limiter buckets are too coarse for public endpoints (candlesticks 429s)

[shazbert]

Summary:
After introduction of request.WithRetryNotAllowed(ctx), GateIO rate limiter currently uses a “standard” bucket (10s/200) for many public endpoints, including candlesticks. This doesn’t align with Gate’s documented limits (e.g., Spot public 900 r/s, Perp public 300 r/s) and appears to cause 429s for candlestick-heavy usage when combined with other public calls.

Observed:

• Candlestick endpoints standardRateLimit() with other public endpoints.
• 429 “Request Rate Limit Exceeded (003)” on candlestick calls.
• Gate REST v4 “API Performance” table shows higher public limits by market bucket.

Proposed update (system-level):

• Need to attach a global rate limit bucket (e.g., Spot public 900 r/s, Perp public 300 r/s) to each sub bucket