dangernoodle-io / TaipanMiner / 25981231415

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fix(diag): serialize Diagnostics page fetches to avoid httpd burst (#407)

init() previously fired 5-7 parallel fetch() calls (diag/asic, levels,
heap, tasks, panic, abnormal-resets) the instant the page mounted.
Each one consumed an httpd client socket simultaneously, blowing past
bb_http's max_open_sockets cap on devices with tight LWIP socket
pools — operator saw "httpd_accept_conn: error in accept (23)" in
device logs.

Convert init() to async and await the data fetches in sequence. SSE
stream (long-lived) starts in parallel since it doesn't compete with
the burst. Page renders immediately; panels populate as their fetch
resolves. End-to-end load is a few hundred ms slower at worst, not
operator-visible, and removes the spike entirely.

Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

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