adding new mindforge applications

Mindforge.API/Models/Enums/LlmProvider.cs

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+namespace Mindforge.API.Models.Enums
+{
+    public enum LlmProvider
+    {
+        OpenAI,
+        Gemini
+    }
+}

Mindforge.API/Models/Requests/FileCheckRequest.cs

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+namespace Mindforge.API.Models.Requests
+{
+    public class FileCheckRequest
+    {
+        public string FileContent { get; set; } = string.Empty;
+        public string FileName { get; set; } = string.Empty;
+
+        /// <summary>
+        /// Expected values: "language" or "content"
+        /// </summary>
+        public string CheckType { get; set; } = string.Empty;
+    }
+}

Mindforge.API/Models/Requests/FlashcardGenerateRequest.cs

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+using System.Text.Json.Serialization;
+
+namespace Mindforge.API.Models.Requests
+{
+    public class FlashcardGenerateRequest
+    {
+        public string FileContent { get; set; } = string.Empty;
+        public string FileName { get; set; } = string.Empty;
+        public int Amount { get; set; }
+        [JsonConverter(typeof(JsonStringEnumConverter))]
+        public FlashcardMode? Mode { get; set; } = FlashcardMode.Simple;
+    }
+
+    public enum FlashcardMode
+    {
+        Basic,
+        Simple,
+        Detailed,
+        Hyper
+    }
+}