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perf(bb_event): drop unnecessary MALLOC_CAP_DMA on dispatch pool (#263)

Fixes B1-206. The dispatch pool buffer is copy-out architecture:
payloads are copied to per-subscriber buffers before any DMA operation.
The DMA-capable flag unnecessarily constrains the pool to internal SRAM
even on PSRAM-equipped boards, fragmenting heap.

Switch to SPIRAM-preferred allocation with fallback to default heap.
PSRAM-equipped boards (e.g., boards with external PSRAM) reclaim internal
SRAM for other uses; non-PSRAM boards (bitaxe-650, tdongle-s3) fall back
to default allocation with no change in behavior.

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

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