feat: Add unit tests and fakes for Crestron environment and data store

- Introduced `FakeCrestronEnvironment` and `FakeEthernetHelper` for testing purposes.
- Implemented `InMemoryCrestronDataStore` to facilitate unit tests for data storage.
- Created `DebugServiceTests` to validate the behavior of debug-related services.
- Added project files for unit tests targeting .NET 9.0 with necessary dependencies.
- Developed production adapters (`CrestronConsoleAdapter`, `CrestronDataStoreAdapter`, `CrestronEnvironmentAdapter`, `CrestronEthernetAdapter`) to interface with the Crestron SDK.
- Updated `Debug` class to utilize injected service abstractions instead of direct SDK calls.
- Enhanced `ControlSystem` initialization to register service adapters before usage.

src/PepperDash.Core/Adapters/CrestronDataStoreAdapter.cs

@@ -0,0 +1,42 @@
+using Crestron.SimplSharp.CrestronDataStore;
+using PepperDash.Core.Abstractions;
+
+namespace PepperDash.Core.Adapters;
+
+/// <summary>
+/// Production adapter — delegates ICrestronDataStore calls to the real Crestron SDK.
+/// </summary>
+public sealed class CrestronDataStoreAdapter : ICrestronDataStore
+{
+    public void InitStore() => CrestronDataStoreStatic.InitCrestronDataStore();
+
+    public bool TryGetLocalInt(string key, out int value)
+    {
+        var err = CrestronDataStoreStatic.GetLocalIntValue(key, out value);
+        return err == CrestronDataStore.CDS_ERROR.CDS_SUCCESS;
+    }
+
+    public bool SetLocalInt(string key, int value)
+    {
+        var err = CrestronDataStoreStatic.SetLocalIntValue(key, value);
+        return err == CrestronDataStore.CDS_ERROR.CDS_SUCCESS;
+    }
+
+    public bool SetLocalUint(string key, uint value)
+    {
+        var err = CrestronDataStoreStatic.SetLocalUintValue(key, value);
+        return err == CrestronDataStore.CDS_ERROR.CDS_SUCCESS;
+    }
+
+    public bool TryGetLocalBool(string key, out bool value)
+    {
+        var err = CrestronDataStoreStatic.GetLocalBoolValue(key, out value);
+        return err == CrestronDataStore.CDS_ERROR.CDS_SUCCESS;
+    }
+
+    public bool SetLocalBool(string key, bool value)
+    {
+        var err = CrestronDataStoreStatic.SetLocalBoolValue(key, value);
+        return err == CrestronDataStore.CDS_ERROR.CDS_SUCCESS;
+    }
+}