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feat: add flush-sink streaming bridge, convert /api/diag dispatcher to it (B1-1077 PR-1) (#945)

- bb_serialize_json: add optional flush_fn/flush_ctx/flush_failed to the
  emit ctx and bb_serialize_json_stream_render(), a distinct entry point
  that flushes the internal buffer through a caller sink instead of
  failing NO_SPACE on overflow -- existing bounded MQTT/UDP/host callers
  are byte-for-byte unaffected (flush_fn stays NULL)
- bb_http_server: add bb_http_serialize_stream() (own header, no new
  public dep on bb_serialize_json for existing consumers), an HTTP
  adapter wiring the flush sink to bb_http_resp_send_chunk()
- platform/espidf/bb_diag: wholesale-convert diag_section_dispatch()'s
  render+respond tail to stream through bb_http_serialize_stream() for
  all four registered sections (meminfo/system/storage-nvs/
  storage-partitions) -- fixed-cardinality sections render byte-identical
  by construction; BB_ARR_STREAM cardinality is PR-2
- fold the held heap-reconciliation branch's substance: bb_meminfo gains
  the exec region + per-region allocated fields, "meminfo" promotes to a
  shared bb_diag_meminfo.c/.h section (floor swaps to it), and the legacy
  /api/diag/heap exact route is deleted


Claude-Session: https://claude.ai/code/session_01VA9XvWjJcbAUGCZpSFfp3H

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

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