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/application.fam

@@ -0,0 +1,12 @@
+# Built-in (firmware-linked) app: it needs the ST GAP/GATT/HCI command API,
+# which the firmware does not export to .fap apps. See ../build.sh.
+App(
+    appid="bt_inspector",
+    name="BT Inspector",
+    apptype=FlipperAppType.APP,
+    entry_point="bt_inspector_app",
+    requires=["gui", "storage"],
+    stack_size=4 * 1024,
+    icon="A_Plugins_14",
+    order=25,
+)