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/collector/redfish_replay.go

@@ -3,7 +3,7 @@ package collector
 import (
 	"encoding/json"
 	"fmt"
-	"log"
+	"log/slog"
 	"sort"
 	"strings"
 	"time"
@@ -32,7 +32,7 @@ func ReplayRedfishFromRawPayloads(rawPayloads map[string]any, emit ProgressFn) (
 		emit(Progress{Status: "running", Progress: 10, Message: "Redfish snapshot: replay service root..."})
 	}
 	if _, err := r.getJSON("/redfish/v1"); err != nil {
-		log.Printf("redfish replay: service root /redfish/v1 missing from snapshot, continuing with defaults: %v", err)
+		slog.Warn("redfish replay: service root /redfish/v1 missing from snapshot, continuing with defaults", "err", err)
 	}
 
 	systemPaths := r.discoverMemberPaths("/redfish/v1/Systems", "/redfish/v1/Systems/1")
@@ -219,7 +219,7 @@ func inferInventoryLastModifiedTime(snapshot map[string]interface{}) time.Time {
 	for _, layout := range []string{time.RFC3339, time.RFC3339Nano} {
 		if ts, err := time.Parse(layout, raw); err == nil {
 			t := ts.UTC()
-			log.Printf("redfish replay: inventory last modified at %s (InventoryData/Status.LastModifiedTime)", t.Format(time.RFC3339))
+			slog.Info("redfish replay: inventory last modified", "at", t.Format(time.RFC3339), "source", "InventoryData/Status.LastModifiedTime")
 			return t
 		}
 	}