Rename solar integration types to VotronicSolarESP

Renames every type and identifier we built for the solar charge
controller bridge from generic "Solar" naming to the product name
VotronicSolarESP: VanAlignSolarProtocol -> VotronicSolarESPProtocol,
SolarSession -> VotronicSolarESPSession, SolarState ->
VotronicSolarESPState, plus the dependent properties, parameters, and
user-facing discovery/empty-state strings.

Purely a Swift-side rename - the underlying BLE service/characteristic
UUIDs are untouched, so it has no effect on communicating with the
actual firmware. DeviceRole.solar's case name, and DemoData's device
instance variables, are left as-is since they describe the role/demo
device rather than this specific integration code.

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

CamperMonitor/Views/AddDeviceView.swift

@@ -195,7 +195,7 @@ private struct ConfigureDeviceView: View {
             }
         } else*/ if discovery.isLevelSensor {
             role = .leveling
-        } else if discovery.isSolarSensor {
+        } else if discovery.isVotronicSolarESPSensor {
             role = .solar
         } /*else if let name = discovery.name?.lowercased(),
                   ["alpicool", "icecube", "ice cube", "fridge", "cool"].contains(where: name.contains) {
@@ -208,8 +208,8 @@ private struct ConfigureDeviceView: View {
         // ohnehin darüber unter "Gefunden als".
         if discovery.isLevelSensor {
             name = "Nivellierung"
-        } else if discovery.isSolarSensor {
-            name = "Solarladeregler"
+        } else if discovery.isVotronicSolarESPSensor {
+            name = role.title
         } else if let advertised = discovery.name, advertised.count <= 20,
            advertised.contains(" ") || advertised.rangeOfCharacter(from: .decimalDigits) == nil {
             name = advertised