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* feat(cloudflare): add --batch-change-size and --batch-change-interval flags Adds two new global CLI flags for controlling batch DNS change behaviour: - --batch-change-size (default 200): maximum number of DNS operations per batch - --batch-change-interval (default 1s): pause between consecutive batch chunks Wires the flags through Config into the Cloudflare provider's DNSRecordsConfig. * feat(cloudflare): implement batch DNS records API with automatic fallback Uses Cloudflare's Batch DNS Records API to submit all creates, updates, and deletes for a zone in a single transactional API call per chunk, significantly reducing the total number of requests made against the Cloudflare API. - Batch size and interval are controlled via --batch-change-size / --batch-change-interval - Record types unsupported by the batch PUT endpoint (e.g. SRV, CAA) are submitted individually via the standard API - If a batch chunk is rejected by Cloudflare, ExternalDNS automatically retries each record change in that chunk individually so no changes are silently lost - Adds cloudflare_batch.go with the core batching logic and full test coverage * feat(cloudflare): soft retry for 'unexpected EOF' (issue 3798) * feat(cloudflare): soft retry for 'unexpected EOF' (issue 3798) * feat(cloudflare): debug logs for intentional invididual-updates * feat(cloudflare): improved code coverage * feat(cloudflare): handle json.Encoder error in test helper