chore: align codebase with bible engineering contracts

- identifier-normalization: use strings.EqualFold in h3c/parser.go
- import-export: CSV now uses UTF-8 BOM and semicolon delimiter
- go-code-style: translate all Russian source strings to English (ADL-007)
- go-background-tasks: add Type, Message, Result fields to Job struct
- go-api: wrap list endpoints in {items, total_count, page, per_page, total_pages}
- module-structure: rename helpers.go → context_sleep.go
- build-version-display: htmlError renders version footer on error pages
- go-logging: migrate all log.Printf calls to log/slog with structured attrs

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

internal/exporter/exporter_csv_test.go

@@ -52,7 +52,13 @@ func TestExportCSV_IncludesAllComponentTypesWithUsableSerials(t *testing.T) {
 		t.Fatalf("ExportCSV failed: %v", err)
 	}
 
-	rows, err := csv.NewReader(bytes.NewReader(buf.Bytes())).ReadAll()
+	b := buf.Bytes()
+	if len(b) >= 3 && b[0] == 0xEF && b[1] == 0xBB && b[2] == 0xBF {
+		b = b[3:] // strip UTF-8 BOM
+	}
+	r := csv.NewReader(bytes.NewReader(b))
+	r.Comma = ';'
+	rows, err := r.ReadAll()
 	if err != nil {
 		t.Fatalf("read csv: %v", err)
 	}