refactor(materials): query materials from database instead of materials.lfn\n\n- Inject PepDB and project MaterialHeader to API shape (MaterialData).\n- Preserve response shape: Number, Name (from Description), Grade, Density, Thickness.\n- Filter single-material by Material string or ID, then map.

PepApi.Core/Controllers/MaterialsController.cs

@@ -1,6 +1,6 @@
 using Microsoft.AspNetCore.Mvc;
-using Microsoft.Extensions.Options;
-using PepApi.Core.Configuration;
+using Microsoft.EntityFrameworkCore;
+using PepLib.Data;
 using PepLib.IO;
 
 namespace PepApi.Core.Controllers;
@@ -9,29 +9,53 @@ namespace PepApi.Core.Controllers;
 [Route("materials")]
 public class MaterialsController : ControllerBase
 {
-    private readonly string _materialsFile;
+    private readonly PepDB _db;
 
-    public MaterialsController(IOptions<PepSettings> settings)
+    public MaterialsController(PepDB db)
     {
-        _materialsFile = settings.Value.MaterialsFile;
+        _db = db;
     }
 
     [HttpGet]
     public async Task<ActionResult<List<MaterialData>>> GetMaterials()
     {
-        var reader = new MaterialDataReader();
-        await Task.Run(() => reader.Read(_materialsFile));
+        var headers = await _db.MaterialHeaders
+            .AsNoTracking()
+            .ToListAsync();
 
-        return Ok(reader.Materials);
+        var materials = headers
+            .Select(m => new MaterialData
+            {
+                Number = int.TryParse(m.Material, out var num) ? num : m.ID,
+                Name = m.Description,
+                Grade = m.MatGrade,
+                Density = m.Density,
+                Thickness = m.Thickness
+            })
+            .ToList();
+
+        return Ok(materials);
     }
 
     [HttpGet("{materialNo:int}")]
     public async Task<ActionResult<List<MaterialData>>> GetMaterial(int materialNo)
     {
-        var reader = new MaterialDataReader();
-        await Task.Run(() => reader.Read(_materialsFile));
+        var headers = await _db.MaterialHeaders
+            .AsNoTracking()
+            .Where(m => m.Material == materialNo.ToString() || m.ID == materialNo)
+            .ToListAsync();
 
-        var materials = reader.Materials.Where(m => m.Number == materialNo).ToList();
+        var materials = headers
+            .Select(m => new MaterialData
+            {
+                Number = int.TryParse(m.Material, out var num) ? num : m.ID,
+                Name = m.Description,
+                Grade = m.MatGrade,
+                Density = m.Density,
+                Thickness = m.Thickness
+            })
+            .Where(m => m.Number == materialNo)
+            .ToList();
 
         if (!materials.Any())
             return NotFound(new { message = $"Material {materialNo} not found" });