Reduce httpd task priority to 5

[kahrendt]

• The lower priority doesn't seem to cause a measurable increase in time message round trip times
• Could be beneficial for ESP32 (plain variant) with ethernet. It's a lower priority than the ethernet task so httpd can't potentially starve it

[Copilot]

Pull request overview

This PR lowers the default FreeRTOS priority used for the ESP-IDF HTTP server task to reduce the chance that the HTTP server can starve higher-importance tasks (notably ethernet) on ESP32 targets, while keeping the sync/decode task priority one level above the HTTP server as documented and implemented.

Changes:

• Reduced SendspinClientConfig::DEFAULT_HTTPD_PRIORITY from 17 to 5.
• Kept the sync/decode task default priority relationship intact (DEFAULT_SYNC_TASK_PRIORITY = DEFAULT_HTTPD_PRIORITY + 1) and updated the integration guide defaults accordingly.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
include/sendspin/config.h	Lowers the default HTTP server task priority; sync/decode default priority remains derived as httpd + 1.
docs/integration-guide.md	Updates documented default httpd_priority to 5 and sync/decode default priority to 6 to match the code.

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