Enhance Tender Management with Company-Based Matching and API Updates

- Updated the tender service to include company-based matching for tenders, allowing for more relevant results based on company CPV codes.
- Modified the ListTenders endpoint to accept a company ID parameter for calculating match percentages and sorting tenders accordingly.
- Refactored the tender response structure to include match percentage and days until deadline for better client-side handling.
- Updated API documentation to reflect changes in the tender listing functionality and added new endpoints for public tender access.
- Removed deprecated customer-related methods and streamlined customer listing functionality for improved clarity and performance.

internal/tender/repository.go

@@ -86,6 +86,13 @@ func NewTenderRepository(mongoManager *mongopkg.ConnectionManager, logger logger
 			{Key: "notice_type_code", Value: 1},
 			{Key: "status", Value: 1},
 		}),
+		// Index for CPV matching queries
+		*mongopkg.NewIndex("cpv_matching_idx", bson.D{
+			{Key: "status", Value: 1},
+			{Key: "main_classification", Value: 1},
+			{Key: "additional_classifications", Value: 1},
+			{Key: "publication_date", Value: -1},
+		}),
 		// Text index for search
 		*mongopkg.CreateTextIndex("search_idx", "title", "description"),
 	}