Add BT Inspector: BLE scanner and GATT explorer for Flipper Zero

Built-in firmware app (needs the full ST BLE stack) with live RSSI-sorted
scan list, advertisement decoding (Apple Continuity, Microsoft CDP, Fast
Pair, Eddystone), connect/discover/read/write/notify, device-info summary,
value history and a timestamped session log. build.sh produces a firmware
update package with COPRO_STACK_TYPE=ble_full and the app compiled in.

bt_inspector/ble_names.h

@@ -0,0 +1,21 @@
+#pragma once
+#include <furi.h>
+#include <stdint.h>
+
+// Lookup tables and decoders. All return static strings or NULL when unknown.
+const char* ble_company_name(uint16_t id);
+const char* ble_uuid_name(const uint8_t* uuid, uint8_t len); // len 2 or 16, little-endian
+const char* ble_appearance_name(uint16_t appearance);
+const char* ble_adv_type_name(uint8_t evt_type);
+const char* ble_att_error_name(uint8_t code);
+
+void ble_hex(FuriString* out, const uint8_t* data, size_t len);
+void ble_uuid_str(FuriString* out, const uint8_t* uuid, uint8_t len);
+void ble_addr_str(FuriString* out, const uint8_t* addr);
+
+// Manufacturer-specific data decoders (Apple Continuity, Microsoft CDP, ...)
+void ble_decode_mfg(FuriString* out, uint16_t company, const uint8_t* d, uint8_t len);
+// Service data decoders (Fast Pair, Eddystone, Exposure Notification, ...)
+void ble_decode_svc_data(FuriString* out, uint16_t uuid, const uint8_t* d, uint8_t len);
+// Characteristic value decoder: appends "decoded" representation(s) of a value.
+void ble_decode_value(FuriString* out, const uint8_t* uuid, uint8_t uuid_len, const uint8_t* d, size_t len);