initial commit

backend/API/DTOs/Materials/MaterialBaseDtos.cs

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+using System.ComponentModel.DataAnnotations;
+
+namespace Extrudex.API.DTOs.Materials;
+
+/// <summary>
+/// Response DTO for MaterialBase entity.
+/// </summary>
+public class MaterialBaseResponse
+{
+    /// <summary>Unique identifier for the material base.</summary>
+    public Guid Id { get; set; }
+
+    /// <summary>Human-readable name (e.g., "PLA", "PETG", "ABS").</summary>
+    public string Name { get; set; } = string.Empty;
+
+    /// <summary>Density in g/cm³ used for grams-derived calculations.</summary>
+    public decimal DensityGperCm3 { get; set; }
+
+    /// <summary>Timestamp when this record was created (UTC).</summary>
+    public DateTime CreatedAt { get; set; }
+
+    /// <summary>Timestamp when this record was last updated (UTC).</summary>
+    public DateTime UpdatedAt { get; set; }
+}
+
+/// <summary>
+/// Request DTO for creating a new MaterialBase.
+/// </summary>
+public class CreateMaterialBaseRequest
+{
+    /// <summary>Human-readable name (e.g., "PLA", "PETG", "ABS"). Required, max 50 characters.</summary>
+    [Required(ErrorMessage = "Name is required.")]
+    [StringLength(50, MinimumLength = 1, ErrorMessage = "Name must be between 1 and 50 characters.")]
+    public string Name { get; set; } = string.Empty;
+
+    /// <summary>Density in g/cm³. Must be greater than zero.</summary>
+    [Required(ErrorMessage = "Density is required.")]
+    [Range(0.001, 100.0, ErrorMessage = "Density must be between 0.001 and 100.0 g/cm³.")]
+    public decimal DensityGperCm3 { get; set; }
+}
+
+/// <summary>
+/// Request DTO for updating an existing MaterialBase.
+/// </summary>
+public class UpdateMaterialBaseRequest
+{
+    /// <summary>Human-readable name (e.g., "PLA", "PETG", "ABS"). Required, max 50 characters.</summary>
+    [Required(ErrorMessage = "Name is required.")]
+    [StringLength(50, MinimumLength = 1, ErrorMessage = "Name must be between 1 and 50 characters.")]
+    public string Name { get; set; } = string.Empty;
+
+    /// <summary>Density in g/cm³. Must be greater than zero.</summary>
+    [Required(ErrorMessage = "Density is required.")]
+    [Range(0.001, 100.0, ErrorMessage = "Density must be between 0.001 and 100.0 g/cm³.")]
+    public decimal DensityGperCm3 { get; set; }
+}

backend/API/DTOs/Materials/MaterialFinishDtos.cs

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+using System.ComponentModel.DataAnnotations;
+
+namespace Extrudex.API.DTOs.Materials;
+
+/// <summary>
+/// Response DTO for MaterialFinish entity.
+/// </summary>
+public class MaterialFinishResponse
+{
+    /// <summary>Unique identifier for the finish.</summary>
+    public Guid Id { get; set; }
+
+    /// <summary>Human-readable name (e.g., "Basic", "Matte", "Silk").</summary>
+    public string Name { get; set; } = string.Empty;
+
+    /// <summary>Foreign key to the parent MaterialBase.</summary>
+    public Guid MaterialBaseId { get; set; }
+
+    /// <summary>Name of the parent material base (for display).</summary>
+    public string MaterialBaseName { get; set; } = string.Empty;
+
+    /// <summary>Timestamp when this record was created (UTC).</summary>
+    public DateTime CreatedAt { get; set; }
+
+    /// <summary>Timestamp when this record was last updated (UTC).</summary>
+    public DateTime UpdatedAt { get; set; }
+}
+
+/// <summary>
+/// Request DTO for creating a new MaterialFinish.
+/// </summary>
+public class CreateMaterialFinishRequest
+{
+    /// <summary>Human-readable name (e.g., "Basic", "Matte", "Silk"). Required, max 50 characters.</summary>
+    [Required(ErrorMessage = "Name is required.")]
+    [StringLength(50, MinimumLength = 1, ErrorMessage = "Name must be between 1 and 50 characters.")]
+    public string Name { get; set; } = string.Empty;
+
+    /// <summary>Foreign key to the parent MaterialBase. Required.</summary>
+    [Required(ErrorMessage = "MaterialBaseId is required.")]
+    public Guid MaterialBaseId { get; set; }
+}
+
+/// <summary>
+/// Request DTO for updating an existing MaterialFinish.
+/// </summary>
+public class UpdateMaterialFinishRequest
+{
+    /// <summary>Human-readable name (e.g., "Basic", "Matte", "Silk"). Required, max 50 characters.</summary>
+    [Required(ErrorMessage = "Name is required.")]
+    [StringLength(50, MinimumLength = 1, ErrorMessage = "Name must be between 1 and 50 characters.")]
+    public string Name { get; set; } = string.Empty;
+
+    /// <summary>Foreign key to the parent MaterialBase. Required.</summary>
+    [Required(ErrorMessage = "MaterialBaseId is required.")]
+    public Guid MaterialBaseId { get; set; }
+}

backend/API/DTOs/Materials/MaterialModifierDtos.cs

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+using System.ComponentModel.DataAnnotations;
+
+namespace Extrudex.API.DTOs.Materials;
+
+/// <summary>
+/// Response DTO for MaterialModifier entity.
+/// </summary>
+public class MaterialModifierResponse
+{
+    /// <summary>Unique identifier for the modifier.</summary>
+    public Guid Id { get; set; }
+
+    /// <summary>Human-readable name (e.g., "Carbon Fiber", "Wood Fill").</summary>
+    public string Name { get; set; } = string.Empty;
+
+    /// <summary>Foreign key to the parent MaterialBase.</summary>
+    public Guid MaterialBaseId { get; set; }
+
+    /// <summary>Name of the parent material base (for display).</summary>
+    public string MaterialBaseName { get; set; } = string.Empty;
+
+    /// <summary>Timestamp when this record was created (UTC).</summary>
+    public DateTime CreatedAt { get; set; }
+
+    /// <summary>Timestamp when this record was last updated (UTC).</summary>
+    public DateTime UpdatedAt { get; set; }
+}
+
+/// <summary>
+/// Request DTO for creating a new MaterialModifier.
+/// </summary>
+public class CreateMaterialModifierRequest
+{
+    /// <summary>Human-readable name (e.g., "Carbon Fiber", "Wood Fill"). Required, max 50 characters.</summary>
+    [Required(ErrorMessage = "Name is required.")]
+    [StringLength(50, MinimumLength = 1, ErrorMessage = "Name must be between 1 and 50 characters.")]
+    public string Name { get; set; } = string.Empty;
+
+    /// <summary>Foreign key to the parent MaterialBase. Required.</summary>
+    [Required(ErrorMessage = "MaterialBaseId is required.")]
+    public Guid MaterialBaseId { get; set; }
+}
+
+/// <summary>
+/// Request DTO for updating an existing MaterialModifier.
+/// </summary>
+public class UpdateMaterialModifierRequest
+{
+    /// <summary>Human-readable name (e.g., "Carbon Fiber", "Wood Fill"). Required, max 50 characters.</summary>
+    [Required(ErrorMessage = "Name is required.")]
+    [StringLength(50, MinimumLength = 1, ErrorMessage = "Name must be between 1 and 50 characters.")]
+    public string Name { get; set; } = string.Empty;
+
+    /// <summary>Foreign key to the parent MaterialBase. Required.</summary>
+    [Required(ErrorMessage = "MaterialBaseId is required.")]
+    public Guid MaterialBaseId { get; set; }
+}