Add solar charge controller integration and firmware

App:
- New DeviceRole.solar with its own BLE session/protocol/state
  (SolarSession, VanAlignSolarProtocol, SolarState), mirroring the
  leveling sensor but deliberately not wired into the Live Activity.
- BluetoothManager now keeps an in-memory history per metric (voltage,
  current, power) instead of a single primary-metric series; cleared on
  app restart by design, not persisted to disk.
- DeviceDetailView shows a channel picker above the history chart when a
  device has more than one chartable metric.
- AddDeviceView recognizes the solar service UUID during setup.
- DemoData gets a simulated solar device so the integration can be
  checked in the simulator without hardware.

Firmware:
- Add esp32_ble_solar.yaml (Votronic solar charge controller over BLE)
  and simulated variants (esp32_ble_sim.yaml, esp32_ble_solar_sim.yaml)
  for testing without a vehicle.
- esp32_ble.yaml: set flash_size/psram for the ESP32-S3 N16R8 module.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

Shared/Models/ConfiguredDevice.swift

@@ -4,33 +4,33 @@ import Foundation
 /// welche Kennzahl als "Hauptwert" auf der Kachel gross dargestellt wird.
 enum DeviceRole: String, Codable, CaseIterable, Identifiable, Sendable {
     //case chargeBooster
-    //case solarCharger
     //case batteryMonitor
     //case bms
     //case fridge
     case leveling
+    case solar
 
     var id: String { rawValue }
 
     var title: String {
         switch self {
             //case .chargeBooster:  return "Ladebooster"
-            //case .solarCharger:   return "Solarladeregler"
             //case .batteryMonitor: return "Batteriemonitor"
             //case .bms:            return "Batterie / BMS"
             //case .fridge:         return "Kühlbox"
         case .leveling:       return "Nivellierung"
+        case .solar:          return "Solarladeregler"
         }
     }
 
     var symbol: String {
         switch self {
             //case .chargeBooster:  return "bolt.car"
-            //case .solarCharger:   return "sun.max"
             //case .batteryMonitor: return "gauge.with.dots.needle.bottom.50percent"
             //case .bms:            return "battery.100percent.bolt"
             //case .fridge:         return "refrigerator"
         case .leveling:       return "level"
+        case .solar:          return "sun.max"
         }
     }