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fix(bb_registry): guard PRE_HTTP tier against double-init (B1-216) (#337)

- add static s_pre_http_walked flag; both bb_registry_init_pre_http() and
  the pre_http step inside bb_registry_init() check the flag and skip the
  walk if already done — whichever runs first sets it, the other is a no-op
- bb_registry_clear_pre_http() resets the flag so tests and re-init
  scenarios work correctly
- apply the same guard to platform/host/bb_registry/bb_registry.c for
  consistency with the espidf backend
- dormant footgun today (no consumer calls init_pre_http() then init()),
  but without the guard a future consumer doing so would double-invoke
  every pre_http component init

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

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