[Server/Client/Protocol] Add developer staff role

Introduce a Developer staff level (proto flag 32, DB admin bit 8) that
sits between admin and moderator: no kick/ban/warn/report/admin powers,
but gets server log access via a new developer command container family
(GET_SERVER_STATS, VIEWLOG_HISTORY) and an idle-timeout exemption.

- Protocol: IsDeveloper flag, developer_commands.proto envelope,
  Command_GetServerStats/Command_GetLogHistory, Response_GetServerStats,
  Command_AdjustMod.should_be_developer
- Servatrice: fail-closed developer dispatcher, uptime snapshot handler,
  shared log history handler reuse, bit-8 DB mapping
- Client: burgundy pawn/badge/labels/sort order, prepareDeveloperCommand,
  minimal Developer stats tab, log tab access, promote/demote actions

Took 24 minutes

Took 18 seconds

# Commit time for manual adjustment:
# Took 15 minutes

cockatrice/src/interface/widgets/tabs/tab_developer.h

@@ -0,0 +1,43 @@
+/**
+ * @file tab_developer.h
+ * @ingroup ServerTabs
+ */
+//! \todo Document this file.
+
+#ifndef TAB_DEVELOPER_H
+#define TAB_DEVELOPER_H
+
+#include "tab.h"
+
+class AbstractClient;
+class QLabel;
+class QPushButton;
+class QTableWidget;
+class Response;
+
+class TabDeveloper : public Tab
+{
+    Q_OBJECT
+private:
+    AbstractClient *client;
+    QTableWidget *statsTable;
+    QPushButton *refreshButton;
+    QLabel *statusLabel;
+
+    void appendStatRow(const QString &name, const QString &value);
+    static QString formatBytes(quint64 bytes);
+
+private slots:
+    void refreshClicked();
+    void serverStatsResponse(const Response &resp);
+
+public:
+    explicit TabDeveloper(TabSupervisor *_tabSupervisor, AbstractClient *_client);
+    void retranslateUi() override;
+    [[nodiscard]] QString getTabText() const override
+    {
+        return tr("Developer");
+    }
+};
+
+#endif