Initial commit

src/PowderCoating.Application/Interfaces/IProfilePhotoService.cs

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+using Microsoft.AspNetCore.Http;
+
+namespace PowderCoating.Application.Interfaces;
+
+public interface IProfilePhotoService
+{
+    /// <summary>
+    /// Saves a profile photo for a user
+    /// Stores in [ContentRoot]/media/{companyId}/profile-photos/{userId}.{ext}
+    /// </summary>
+    /// <param name="file">The photo file to upload</param>
+    /// <param name="userId">The user's ID</param>
+    /// <param name="companyId">The company's ID</param>
+    /// <returns>Tuple with success status, relative file path, and error message if any</returns>
+    Task<(bool Success, string FilePath, string ErrorMessage)> SaveProfilePhotoAsync(
+        IFormFile file,
+        string userId,
+        int companyId);
+
+    /// <summary>
+    /// Deletes a user's profile photo
+    /// </summary>
+    /// <param name="filePath">Relative path to the photo file</param>
+    /// <returns>Tuple with success status and error message if any</returns>
+    Task<(bool Success, string ErrorMessage)> DeleteProfilePhotoAsync(string filePath);
+
+    /// <summary>
+    /// Gets a profile photo
+    /// </summary>
+    /// <param name="filePath">Relative path to the photo</param>
+    /// <returns>Tuple with success status, file bytes, content type, and error message</returns>
+    Task<(bool Success, byte[] FileContent, string ContentType, string ErrorMessage)> GetProfilePhotoAsync(string filePath);
+
+    /// <summary>
+    /// Checks if a profile photo exists
+    /// </summary>
+    /// <param name="filePath">Relative path to the photo</param>
+    /// <returns>True if exists, false otherwise</returns>
+    Task<bool> ProfilePhotoExistsAsync(string filePath);
+
+}