fix(logging): stamp origin server_id into panel error logs (LB vs MAIN)

panel_logs entries could not be attributed to their origin node: FileLogger wrote
each record WITHOUT server_id, and ErrorsCronJob::parseLog always tagged rows with
the SERVER_ID of whichever node parsed the file — so a log written on an LB but
collected/parsed as MAIN showed up as MAIN (server_id=1), making 'is this error
from the LB or MAIN?' unanswerable.

- FileLogger::log() now stamps server_id into the record at write time (guarded by
  defined('SERVER_ID') for very-early failures), so each log line is self-describing.
- ErrorsCronJob::parseLog() reads that server_id and inserts it, falling back to the
  local SERVER_ID for legacy files written before the field existed.
- server_id is now part of the dedup hash / `unique` key, so the same error from
  LB and MAIN stays two distinct rows instead of INSERT IGNORE collapsing them into
  one and losing the attribution.

The panel_logs table already has the server_id column; nothing schema-side to add.

src/Cli/CronJobs/ErrorsCronJob.php

@@ -88,6 +88,12 @@ class ErrorsCronJob implements CommandInterface {
             $rLogTime = (int) ($row['time'] ?? time());
             $rLogFile = (string) ($row['file'] ?? '');
             $rLogEnv = (string) ($row['env'] ?? php_sapi_name());
+            // Prefer the origin server stamped into the record (FileLogger); fall
+            // back to this node's SERVER_ID for legacy files written before the
+            // field existed. This is what lets a panel_logs row show LB vs MAIN.
+            $rLogServerID = (isset($row['server_id']) && is_numeric($row['server_id']))
+                ? (int) $row['server_id']
+                : SERVER_ID;
 
             if (
                 stripos($rLogMessage, 'server has gone away') !== false ||
@@ -97,7 +103,11 @@ class ErrorsCronJob implements CommandInterface {
                 continue;
             }
 
+            // server_id is part of the key so the SAME error from LB and MAIN keeps
+            // two distinct panel_logs rows — INSERT IGNORE on `unique` would
+            // otherwise collapse them into one and lose the per-server attribution.
             $hash = md5(
+                $rLogServerID .
                 $rLogType .
                 $rLogMessage .
                 $rLogExtra .
@@ -112,7 +122,7 @@ class ErrorsCronJob implements CommandInterface {
 
             $query .= sprintf(
                 "(%d,%s,%s,%s,%s,%s,%s,%s,%s),",
-                SERVER_ID,
+                $rLogServerID,
                 $this->sqlValue($rLogType),
                 $this->sqlValue($rLogMessage),
                 $this->sqlValue($rLogExtra),

src/Core/Logging/FileLogger.php

@@ -96,6 +96,11 @@ class FileLogger implements LoggerInterface {
             'line'    => $line,
             'time'    => time(),
             'env'     => php_sapi_name(),
+            // Origin node, stamped at write time so a log is self-describing (LB vs
+            // MAIN) regardless of which node later parses it. Guarded because a very
+            // early failure can log before SERVER_ID is defined; the collector then
+            // falls back to its own SERVER_ID.
+            'server_id' => defined('SERVER_ID') ? SERVER_ID : null,
         ];
 
         $logLine = base64_encode(json_encode($rData, JSON_UNESCAPED_UNICODE)) . "\n";