adding new mindforge applications

Mindforge.API/Controllers/FileController.cs

@@ -0,0 +1,43 @@
+using System;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Mvc;
+using Mindforge.API.Exceptions;
+using Mindforge.API.Models.Requests;
+using Mindforge.API.Services.Interfaces;
+
+namespace Mindforge.API.Controllers
+{
+    [ApiController]
+    [Route("api/v1/file")]
+    public class FileController : ControllerBase
+    {
+        private readonly IFileService _fileService;
+
+        public FileController(IFileService fileService)
+        {
+            _fileService = fileService;
+        }
+
+        [HttpPost("check")]
+        public async Task<IActionResult> CheckFile([FromBody] FileCheckRequest request)
+        {
+            if (string.IsNullOrWhiteSpace(request.FileContent) || string.IsNullOrWhiteSpace(request.CheckType))
+            {
+                throw new UserException("FileContent and CheckType are required.");
+            }
+
+            try
+            {
+                var base64Bytes = Convert.FromBase64String(request.FileContent);
+                request.FileContent = System.Text.Encoding.UTF8.GetString(base64Bytes);
+            }
+            catch (FormatException)
+            {
+                throw new UserException("FileContent must be a valid base64 string.");
+            }
+
+            var response = await _fileService.CheckFileAsync(request);
+            return Ok(new { result = response });
+        }
+    }
+}