Keep MetricsCollector enabled in local dev; only disable RateLimitMiddleware

[Copilot]

The previous change mistakenly disabled both metricsCollector and rateLimitMiddleware in local dev environments. Only rate limiting should be skipped in local dev.

Changes

• api/server.go: Split the single initialization guard into two separate conditions:
  • metricsCollector — gated on writePool != nil && config.Env != "test" (enabled in local dev)
  • rateLimitMiddleware — additionally gated on !isLocalDev (disabled in local dev)

if writePool != nil && config.Env != "test" {
    metricsCollector = NewMetricsCollector(logger, writePool)
    if !isLocalDev {
        rateLimitMiddleware = NewRateLimitMiddleware(logger, writePool)
    }
}

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