Initial commit

src/PowderCoating.Core/Entities/AiItemPrediction.cs

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+namespace PowderCoating.Core.Entities;
+
+/// <summary>
+/// Stores the raw AI prediction data captured at analysis time.
+/// Both QuoteItem and JobItem carry a nullable FK to this table so the
+/// same prediction record is shared when a quote converts to a job —
+/// no duplication, clean lineage for reporting.
+/// </summary>
+public class AiItemPrediction : BaseEntity
+{
+    // Raw AI predictions — captured once, never mutated
+    public decimal PredictedSurfaceAreaSqFt { get; set; }
+    public int PredictedMinutes { get; set; }
+    public string PredictedComplexity { get; set; } = "Moderate";   // Simple|Moderate|Complex|Extreme
+    public decimal PredictedUnitPrice { get; set; }                 // EstimatedUnitPrice shown to user in wizard
+    public string Confidence { get; set; } = "Medium";              // Low|Medium|High
+    public string? Reasoning { get; set; }                          // AI explanation text
+    public string? AiTags { get; set; }                             // Comma-separated tags from fixed taxonomy
+    public int ConversationRounds { get; set; } = 1;                // How many follow-up rounds were needed
+
+    // Set when the item is saved: was the AI surface area or price overridden by the user?
+    public bool UserOverrodeEstimate { get; set; }
+}