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feat: make bb_storage/bb_config NVS-type-aware (native typed entries) (#773)

- bb_storage.h: add bb_storage_enc_t and optional get_typed/set_typed vtable
  pair (validated together at registration); public bb_storage_get_typed/
  set_typed dispatch to the backend hook when present, else fall back to
  plain get/set (blob semantics) -- zero behavior change for ram/host/sdcard
- bb_storage_nvs: implement get_typed/set_typed mapping enc to native NVS
  typed calls (nvs_get/set_u8/u16/u32/i32/str), preserving on-flash type
  tags; add bb_storage_nvs_set_i32/get_i32; no-fallback scalar get variants
  propagate NOT_FOUND (incl. type-mismatch) to the facade instead of baking
  in a caller fallback; extract bb_storage_nvs_classify_enc for host branch
  coverage
- bb_config.c: add cfg_type_to_enc mapper and route scalar/str/blob
  accessors through bb_storage_get_typed/set_typed; bb_config.h unchanged
- host tests: facade dispatch+fallback, register_backend pair validation,
  classify_enc branches, cfg_type_to_enc mapper
- examples/smoke: ESP-IDF target selftest proving bb_nv_set_str <->
  bb_config_get_str (and reverse) byte-identity round trip over the shared
  native NVS STR path; on-device run deferred to the hardware flash gate

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

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