feat(discovery): improve scan metrics, node enrichment, and configuration restoration

- Implement distance tracking using `latLongToMeter` and a new `getMaxDistance` DAO query
- Calculate Airtime Rate as a delta over time to align with telemetry specifications
- Capture and restore the full `LoRaConfig` instead of just the modem preset after a scan
- Persist local radio statistics (Tx/Rx counts, uptime, relay stats) in preset results
- Backfill missing node names and positions from the local NodeDB during discovery
- Refactor `DiscoveryScanEngine` to use injected `CoroutineDispatchers` and `ApplicationCoroutineScope`
- Reduce BLE connection priority request delay in `BleRadioTransport` to 1 second
- Improve test reliability by replacing fixed `Thread.sleep` calls with state-based polling and `delay`

Author: jamesarich

core/database/src/commonMain/kotlin/org/meshtastic/core/database/dao/DiscoveryDao.kt

@@ -100,6 +100,15 @@ interface DiscoveryDao {
     )
     suspend fun getUniqueNodeCount(sessionId: Long): Int
 
+    @Query(
+        """
+        SELECT MAX(distance_from_user) FROM discovered_node dn
+        INNER JOIN discovery_preset_result dpr ON dn.preset_result_id = dpr.id
+        WHERE dpr.session_id = :sessionId
+        """,
+    )
+    suspend fun getMaxDistance(sessionId: Long): Double?
+
     @Transaction
     @Query("SELECT * FROM discovery_session WHERE id = :sessionId")
     suspend fun getSessionWithResults(sessionId: Long): DiscoverySessionEntity?

core/network/src/commonMain/kotlin/org/meshtastic/core/network/radio/BleRadioTransport.kt

@@ -358,7 +358,7 @@ class BleRadioTransport(
                     Logger.d { "[$address] Requested high BLE connection priority" }
                     // Wait for the connection parameter update to succeed before starting the heavy traffic
                     // in onConnect(). Otherwise, the Android BLE stack may disconnect with GATT 147.
-                    delay(2.seconds)
+                    delay(1.seconds)
                 }
 
                 this@BleRadioTransport.callback.onConnect()