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feat(bb_mem): add cap-specific facade variants and route cap-constrained sites through bb_mem (#610)

- add bb_malloc_internal, bb_calloc_internal (MALLOC_CAP_INTERNAL|8BIT, no fallback) for
  mbedtls arena and control-structure allocations that must stay out of PSRAM
- add bb_malloc_dma (MALLOC_CAP_DMA, hard-fail no-fallback) for SPI scanline buffers;
  PSRAM is not DMA-accessible on classic ESP32 so any fallback would cause silent corruption
- add bb_realloc_prefer_spiram (SPIRAM|8BIT with DEFAULT-cap fallback) for growing buffers;
  documents the cross-heap caveat (do not pass pointers from internal/dma variants)
- add track_realloc helper in both backends: captures old allocated size before realloc,
  adjusts outstanding/peak/internal counters on success, no-op on NULL return
- fix B1-428: add #undef before the CONFIG_BB_MEM_STATS_ENABLE bridge define to suppress
  redefinition warning when the symbol is pre-defined via build_flags
- migrate bb_heap_arena fallback calloc → bb_calloc_internal; paired free → bb_mem_free
- migrate bb_log StaticRingbuffer_t alloc → bb_malloc_internal; all three paired
  heap_caps_free(s_rb_static) sites → bb_mem_free
- migrate bb_display_st77xx scanline alloc → bb_malloc_dma; paired free → bb_mem_free
- migrate bb_event_ring default s_snap_calloc/free → bb_calloc_prefer_spiram/bb_mem_free
  so snapshot temp buffers prefer SPIRAM; reset_allocator restores to the same defaults
- migrate bb_http_host body realloc → bb_realloc_prefer_spiram; paired free → bb_mem_free
- migrate bb_led_apa102 slot buf realloc → bb_realloc_prefer_spiram; all three paired
  frees (bb_led_apa102_host_reset, do_flush) → bb_mem_free
- extend test_bb_mem with 10 new tests: happy-path for all 4 new variants plus
  accounting-balance tests verifying outstanding returns to 0 after malloc/realloc/free cycles

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

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