Enhance documentation and update DocumentChunk model

Updated `copilot-instructions.md` to include new guidelines for Markdown documentation and testing practices. Modified the `DocumentChunk` record in `DocumentChunk.cs` to add `PageNumber` and `IndexOnPage` properties. Adjusted `GetChunksAsync` and `GetChunkEmbeddingAsync` methods in `DocumentService.cs` to accommodate the new properties.

SqlDatabaseVectorSearch/Models/DocumentChunk.cs

@@ -1,3 +1,3 @@
 namespace SqlDatabaseVectorSearch.Models;
 
-public record class DocumentChunk(Guid Id, int Index, string Content, float[]? Embedding = null);
+public record class DocumentChunk(Guid Id, int Index, string Content, int? PageNumber, int IndexOnPage, float[]? Embedding = null);

SqlDatabaseVectorSearch/Services/DocumentService.cs

@@ -19,7 +19,7 @@ public class DocumentService(ApplicationDbContext dbContext)
     public async Task<IEnumerable<DocumentChunk>> GetChunksAsync(Guid documentId, CancellationToken cancellationToken = default)
     {
         var documentChunks = await dbContext.DocumentChunks.Where(c => c.DocumentId == documentId).OrderBy(c => c.Index)
-            .Select(c => new DocumentChunk(c.Id, c.Index, c.Content, null))
+            .Select(c => new DocumentChunk(c.Id, c.Index, c.Content, c.PageNumber, c.IndexOnPage, null))
             .ToListAsync(cancellationToken);
 
         return documentChunks;
@@ -28,7 +28,7 @@ public class DocumentService(ApplicationDbContext dbContext)
     public async Task<DocumentChunk?> GetChunkEmbeddingAsync(Guid documentId, Guid documentChunkId, CancellationToken cancellationToken = default)
     {
         var documentChunk = await dbContext.DocumentChunks.Where(c => c.Id == documentChunkId && c.DocumentId == documentId)
-            .Select(c => new DocumentChunk(c.Id, c.Index, c.Content, c.Embedding))
+            .Select(c => new DocumentChunk(c.Id, c.Index, c.Content, c.PageNumber, c.IndexOnPage, c.Embedding))
             .FirstOrDefaultAsync(cancellationToken);
 
         return documentChunk;