refactor: Rename Project to Job with enhanced model

Rename the Project concept to Job for clarity:
- Add Job, JobPart, JobStock entities
- JobStock supports both inventory stock and custom lengths
- Add JobNumber field for job identification
- Add priority-based stock allocation for cut optimization
- Include Jobs UI pages (Index, Edit, Results)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

CutList.Web/Data/Entities/Job.cs

@@ -0,0 +1,19 @@
+namespace CutList.Web.Data.Entities;
+
+public class Job
+{
+    public int Id { get; set; }
+    public string JobNumber { get; set; } = string.Empty;
+    public string? Name { get; set; }
+    public string? Customer { get; set; }
+    public int? CuttingToolId { get; set; }
+    public string? Notes { get; set; }
+    public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+    public DateTime? UpdatedAt { get; set; }
+
+    public CuttingTool? CuttingTool { get; set; }
+    public ICollection<JobPart> Parts { get; set; } = new List<JobPart>();
+    public ICollection<JobStock> Stock { get; set; } = new List<JobStock>();
+
+    public string DisplayName => string.IsNullOrWhiteSpace(Name) ? JobNumber : $"{JobNumber} - {Name}";
+}

CutList.Web/Data/Entities/JobPart.cs

@@ -0,0 +1,15 @@
+namespace CutList.Web.Data.Entities;
+
+public class JobPart
+{
+    public int Id { get; set; }
+    public int JobId { get; set; }
+    public int MaterialId { get; set; }
+    public string Name { get; set; } = string.Empty;
+    public decimal LengthInches { get; set; }
+    public int Quantity { get; set; } = 1;
+    public int SortOrder { get; set; }
+
+    public Job Job { get; set; } = null!;
+    public Material Material { get; set; } = null!;
+}

CutList.Web/Data/Entities/JobStock.cs

@@ -0,0 +1,46 @@
+namespace CutList.Web.Data.Entities;
+
+/// <summary>
+/// Represents stock allocated to a specific job.
+/// Can reference an existing StockItem with quantity override,
+/// or define a custom length just for this job.
+/// </summary>
+public class JobStock
+{
+    public int Id { get; set; }
+    public int JobId { get; set; }
+    public int MaterialId { get; set; }
+
+    /// <summary>
+    /// If set, references an existing stock item. Null for custom job-specific lengths.
+    /// </summary>
+    public int? StockItemId { get; set; }
+
+    /// <summary>
+    /// Length in inches. For stock items, copied from StockItem.LengthInches.
+    /// For custom lengths, user-specified.
+    /// </summary>
+    public decimal LengthInches { get; set; }
+
+    /// <summary>
+    /// Quantity to use for this job. Can be less than or equal to available stock.
+    /// For custom lengths, represents unlimited available.
+    /// </summary>
+    public int Quantity { get; set; } = 1;
+
+    /// <summary>
+    /// True if this is a custom length just for this job (not from inventory).
+    /// </summary>
+    public bool IsCustomLength { get; set; }
+
+    /// <summary>
+    /// Priority for bin packing. Lower values are used first.
+    /// </summary>
+    public int Priority { get; set; } = 10;
+
+    public int SortOrder { get; set; }
+
+    public Job Job { get; set; } = null!;
+    public Material Material { get; set; } = null!;
+    public StockItem? StockItem { get; set; }
+}