address code review: fix inclusive to-date filter, add retention error handling

- LoggingService.findLogs(): the `to` date filter compared a date-only
  string (e.g. from a date picker) against a timestamp column, which
  parses to midnight and silently excludes the entire last day. Widen
  it to end-of-day so the range is genuinely inclusive.
- LogRetentionScheduler.cleanupOldLogs(): wrap the delete in try/catch
  and log failures via logger.error, matching the existing convention
  in CashboxExportScheduler/RecurringTransactionsScheduler. Without
  this, a failed nightly cleanup would fail silently - exactly what
  this feature exists to prevent.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

myteamwallet_backend/src/database/logging/log-retention.scheduler.ts

@@ -21,12 +21,21 @@ export class LogRetentionScheduler {
     const cutoff = new Date();
     cutoff.setUTCDate(cutoff.getUTCDate() - retentionDays);
 
-    const result = await this.repository.delete({ createdAt: LessThan(cutoff) });
+    try {
+      const result = await this.repository.delete({ createdAt: LessThan(cutoff) });
 
-    await this.logger.info({
-      event: 'log_retention_cleanup_run',
-      details: `deletedCount=${result.affected ?? 0} retentionDays=${retentionDays}`,
-      userId: -1,
-    });
+      await this.logger.info({
+        event: 'log_retention_cleanup_run',
+        details: `deletedCount=${result.affected ?? 0} retentionDays=${retentionDays}`,
+        userId: -1,
+      });
+    } catch (error) {
+      const errorMessage = error instanceof Error ? error.message : String(error);
+      await this.logger.error({
+        event: 'log_retention_cleanup_run_fail',
+        details: errorMessage,
+        userId: -1,
+      });
+    }
   }
 }