Initial commit

src/PowderCoating.Application/Interfaces/ICompanyLogoService.cs

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+using Microsoft.AspNetCore.Http;
+
+namespace PowderCoating.Application.Interfaces;
+
+public interface ICompanyLogoService
+{
+    /// <summary>
+    /// Save company logo to filesystem
+    /// </summary>
+    Task<(bool Success, string FilePath, string ErrorMessage)> SaveCompanyLogoAsync(IFormFile file, int companyId);
+
+    /// <summary>
+    /// Delete company logo from filesystem
+    /// </summary>
+    Task<(bool Success, string ErrorMessage)> DeleteCompanyLogoAsync(string filePath);
+
+    /// <summary>
+    /// Get company logo from filesystem
+    /// </summary>
+    Task<(bool Success, byte[] FileContent, string ContentType, string ErrorMessage)> GetCompanyLogoAsync(string filePath);
+
+    /// <summary>
+    /// Check if company logo exists
+    /// </summary>
+    Task<bool> CompanyLogoExistsAsync(string filePath);
+
+    /// <summary>
+    /// Get the expected logo path for a company
+    /// </summary>
+    string GetCompanyLogoPath(int companyId, string extension);
+}