Initial commit

src/PowderCoating.Application/Interfaces/IInventoryAiLookupService.cs

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+namespace PowderCoating.Application.Interfaces;
+
+public class InventoryAiLookupResult
+{
+    public bool Success { get; set; }
+    public string? ErrorMessage { get; set; }
+
+    // Identity
+    public string? Manufacturer { get; set; }
+    public string? ManufacturerPartNumber { get; set; }
+    public string? ColorName { get; set; }
+    public string? ColorCode { get; set; }
+    public string? Description { get; set; }
+
+    // Coating specs
+    public string? Finish { get; set; }
+    public decimal? CureTemperatureF { get; set; }
+    public int? CureTimeMinutes { get; set; }
+    public string? ColorFamilies { get; set; }   // comma-separated e.g. "Green,Blue"
+    public bool? RequiresClearCoat { get; set; }
+
+    // Application properties
+    public decimal? CoverageSqFtPerLb { get; set; }  // typical ~80-120 sq ft/lb
+    public decimal? TransferEfficiency { get; set; }  // typical 50-75%
+    public decimal? UnitCostPerLb { get; set; }       // price per lb/unit if found in search results
+    public string? VendorName { get; set; }           // manufacturer/vendor name for dropdown matching
+    public string? SpecPageUrl { get; set; }          // URL of the product page that was fetched
+
+    public string? Reasoning { get; set; }       // brief explanation of what was found
+}
+
+public interface IInventoryAiLookupService
+{
+    /// <summary>
+    /// Search the web for powder coating product info and use AI to extract structured data.
+    /// </summary>
+    Task<InventoryAiLookupResult> LookupAsync(
+        string? manufacturer,
+        string? colorName,
+        string? colorCode,
+        string? partNumber);
+}