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perf(bb_log): lazy-allocate stream ringbuffer instead of static BSS (#264)

Fixes B1-207. The 6 KB ringbuffer for SSE log consumers was permanently
resident in BSS, consuming heap fragmentation even when no log viewer was
attached. Convert to heap allocation (SPIRAM-preferred with fallback,
matching PR #263 B1-206 pattern) gated on bb_log_stream_init().

bb_log_stream_init() is now idempotent: subsequent calls return BB_OK
immediately. Allocation uses CONFIG_BB_LOG_STREAM_BUF_BYTES (default
6144, tunable) to allow firmware customization. Error handling ensures
no half-initialized state on allocation failure.

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

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