refactor: привести кодовую базу в соответствие с канонами bible

- 400 → 422 для всех ошибок валидации входных данных (handlers: export, quote, sync, vendor_spec, partnumber_books, pricelist)
- SQL-запросы вынесены из handlers в localdb (partnumber_books, pricelist, support_bundle); ValidateMariaDBConnection перенесён в internal/db/validate.go
- List-ответы унифицированы: ключ items, поля total_count/page/per_page/total_pages (component, pricelist, partnumber_books); шаблоны обновлены
- Молчаливые ошибки заменены на slog.Warn/Error (support_bundle, vendor_spec, component, configuration, local_configuration, localdb)
- N+1 запросы устранены: batch-запросы в export.go и vendor_workspace_import.go
- fmt.Println → slog в cmd/ (qfs, migrate, migrate_ops_projects, migrate_project_updated_at)
- Заголовки recovery/verify добавлены во все 28 SQL-миграций
- Добавлены bible-local/runtime-flows.md и bible-local/decisions/
- Обновлён субмодуль bible до v0.2.0-13

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

internal/services/local_configuration.go

@@ -4,6 +4,7 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
+	"log/slog"
 	"strings"
 	"time"
 
@@ -118,8 +119,10 @@ func (s *LocalConfigurationService) Create(ownerUsername string, req *CreateConf
 	}
 	cfg.Line = localCfg.Line
 
-	// Record usage stats
-	_ = s.quoteService.RecordUsage(req.Items)
+	// Record usage stats (best-effort)
+	if err := s.quoteService.RecordUsage(req.Items); err != nil {
+		slog.Warn("local configuration: could not record usage stats", "err", err)
+	}
 
 	return cfg, nil
 }
@@ -407,7 +410,9 @@ func (s *LocalConfigurationService) RefreshPrices(uuid string, ownerUsername str
 
 	// Refresh local pricelists when online.
 	if s.isOnline() {
-		_ = s.syncService.SyncPricelistsIfNeeded()
+		if err := s.syncService.SyncPricelistsIfNeeded(); err != nil {
+			slog.Warn("local configuration: background pricelist sync failed", "err", err)
+		}
 	}
 
 	// Use the pricelist stored in the config; fall back to latest if unavailable.
@@ -791,7 +796,9 @@ func (s *LocalConfigurationService) RefreshPricesNoAuth(uuid string, pricelistSe
 	}
 
 	if s.isOnline() {
-		_ = s.syncService.SyncPricelistsIfNeeded()
+		if err := s.syncService.SyncPricelistsIfNeeded(); err != nil {
+			slog.Warn("local configuration: background pricelist sync failed", "err", err)
+		}
 	}
 
 	// Resolve which pricelist to use: