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feat(bb_ring): ring registry consuming the generic bb_registry primitive (#627)

- add bb_ring_capacity() getter (only missing scalar; count/dropped/
  truncated/bytes_used already existed)
- add bb_ring_registry (components/bb_ring/include/bb_ring_registry.h,
  platform/host/bb_ring/bb_ring_registry.c): thin consumer of bb_registry,
  one BB_REGISTRY_DEFINE_TAGGED("rings") registry, value = bb_ring_t
- bb_ring_registry.h forward-declares its own bb_ring_t instead of
  including bb_ring.h — keeps the dependency one-directional (bb_ring
  compiles bb_ring_registry.c as part of the same component; no
  cross-component circular REQUIRES)
- deregister-by-value resolves the name via bb_registry_foreach scanning
  for a matching value (least invasive: no bb_ring.h dependency in the
  registry, no extra field on bb_ring_t — bb_ring already stores its own
  name internally but that's not needed here)
- bb_ring_create self-registers after all allocs succeed (best-effort: a
  full registry or duplicate name is logged and does NOT fail ring
  creation); bb_ring_destroy deregisters before freeing — covers runtime
  destroy/recreate (B1-419) automatically
- Kconfig BB_RING_REGISTRY_MAX (default 12, range 1-32) bridged via the
  mandatory CONFIG_ pattern; C default matches Kconfig default
- GET /api/diag/rings lives in its own new component (bb_ring_diag,
  espidf-only), NOT in bb_diag core — mirrors how bb_event_routes_espidf
  owns GET /api/diag/events. Self-registers via BB_INIT_REGISTER_PRE_HTTP
  + BB_INIT_REGISTER, gated by CONFIG_BB_RING_DIAG_AUTOREGISTER (default
  y, infrastructure route). Emits top-level count/registry_capacity +
  rings[] of {name,count,capacity,dropped,truncated,bytes_used} via
  bb_ring_registry_foreach
- wire bb_ring_diag into examples/smoke (components/ dir already covers
  it via existing EXTRA_COMPONENT_DIRS) and BB_RING_REGISTRY_TESTING into
  the platformio.ini native test env
- test/test_host/test_bb_ring_registry.c: register/de... (continued)

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