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refactor(bb_ota_hooks): single-slot hooks -> multi-consumer registration lists (B1-446) (#635)

- replace s_pause_cb/s_resume_cb/s_progress_cb/s_skip_check_cb single slots with
  fixed-size registration lists (BB_OTA_HOOKS_MAX=4)
- bb_ota_set_hooks/set_progress_cb/set_skip_check_cb now append instead of
  overwrite; signatures unchanged (back-compat, TM-safe)
- dispatch all registered hooks: pause/resume in registration order (resume
  mirrors pause's set); progress fires all; skip-check combines via OR
  (skip if any registrant requests it); pause combines via OR
- overflow beyond cap is dropped with a bb_log_w warning (high-watermark warn
  at cap-1); void setter signatures can't return bb_err_t so this is
  logged, not propagated
- add bb_ota_hooks_{pause,progress,skip_check}_count() observability getters
- add BB_OTA_HOOKS_TESTING-gated bb_ota_hooks_test_reset() for test isolation
  (replaces the old set-to-NULL reset pattern, which no longer clears an
  append-only list)
- extend host tests: dual registration fires both, registration order
  preserved, overflow drops at cap, pause/skip-check OR-combine semantics

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