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Some IoT devices respond over KLAP with a plain `200 OK` html page instead of a proper response when the response would be too large to construct, causing a "not a multiple of the block length" decryption error (e.g., KS200M in #1828). This PR lowers the maximum response size to 2048 bytes for IoT devices using KLAP, so that the update is split into multiple smaller requests like it is already done for bulbs. In details: - `IotDevice.max_device_response_size` returns 2048 over KLAP. Bulbs keep 4096 and XOR devices keep 16 KiB. - `KlapTransport` checks the response length and signature before decrypting, and raises a `KasaException` telling what was wrong instead of the decryption error. Fixes #1828 Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>