Started adding module service

I will probably change the api paths and a lot of other stuff i wrote today tomorrow :|

Moonlight.ApiServer/Services/ModuleService.cs

@@ -0,0 +1,74 @@
+using System.Text.Json;
+using MoonCore.Helpers;
+using Moonlight.ApiServer.Models;
+
+namespace Moonlight.ApiServer.Services;
+
+public class ModuleService
+{
+    private readonly ILogger<ModuleService> Logger;
+    private readonly Dictionary<string, ModuleModel> ModuleMeta = new();
+    private static string ModulePath = PathBuilder.Dir("storage", "modules");
+
+    public ModuleModel[] Modules => ModuleMeta.Values.ToArray();
+    
+    public ModuleService(ILogger<ModuleService> logger)
+    {
+        Logger = logger;
+    }
+
+    public void Load()
+    {
+        Logger.LogInformation("Loading modules");
+        
+        Directory.CreateDirectory(ModulePath);
+
+        foreach (var moduleDirectory in Directory.EnumerateDirectories(ModulePath))
+        {
+            var metaPath = PathBuilder.File(moduleDirectory, "meta.json");
+            
+            if (!File.Exists(metaPath))
+            {
+                Logger.LogWarning("No meta.json found in {folder}", moduleDirectory);
+                continue;
+            }
+
+            ModuleModel moduleModel;
+
+            try
+            {
+                var json = File.ReadAllText(metaPath);
+                moduleModel = JsonSerializer.Deserialize<ModuleModel>(json)!;
+            }
+            catch (Exception e)
+            {
+                Logger.LogError("An error occured while loading meta.json in {folder}: {e}", moduleDirectory, e);
+                continue;
+            }
+            
+            ModuleMeta.Add(moduleDirectory, moduleModel);
+        }
+        
+        Logger.LogInformation("Loaded {count} modules", ModuleMeta.Count);
+    }
+
+    public string[] GetModuleDlls(string moduleName, string section)
+    {
+        if (ModuleMeta.All(x => x.Value.Name != moduleName))
+            throw new ArgumentException($"No module with the name '{moduleName}' found");
+        
+        var moduleKvp = ModuleMeta
+            .FirstOrDefault(x => x.Value.Name == moduleName);
+
+        var module = moduleKvp.Value;
+
+        if (!module.Modules.ContainsKey(section))
+            return [];
+
+        var modulePaths = module.Modules[section].Select(
+            dllName => PathBuilder.File(ModulePath, moduleKvp.Key, "bin", section, dllName)
+        ).Where(File.Exists).ToArray();
+
+        return modulePaths;
+    }
+}