[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_supervisor.h

@@ -45,6 +45,7 @@ class TabReport;
 class TabModeration;
 class TabAccount;
 class TabDeckEditor;
+class TabDeveloper;
 class TabLog;
 class RoomEvent;
 class GameEventContainer;
@@ -108,6 +109,7 @@ private:
     TabLog *tabLog;
     TabReport *tabReport;
     TabModeration *tabModeration;
+    TabDeveloper *tabDeveloper;
     QMap<int, TabRoom *> roomTabs;
     QMap<int, TabGame *> gameTabs;
     QList<TabGame *> replayTabs;
@@ -117,7 +119,7 @@ private:
 
     QAction *aTabHome, *aTabDeckEditor, *aTabVisualDeckEditor, *aTabEdhRec, *aTabArchidekt, *aTabVisualDeckStorage,
         *aTabVisualDatabaseDisplay, *aTabServer, *aTabAccount, *aTabDeckStorage, *aTabReplays, *aTabAdmin,
-        *aTabCardArtRules, *aTabLog, *aTabReport, *aTabModeration;
+        *aTabCardArtRules, *aTabLog, *aTabReport, *aTabModeration, *aTabDeveloper;
 
     int myAddTab(Tab *tab, QAction *manager = nullptr);
     void addCloseButtonToTab(Tab *tab, int tabIndex, QAction *manager);
@@ -207,6 +209,7 @@ private slots:
     void actTabLog(bool checked);
     void actTabReport(bool checked);
     void actTabModeration(bool checked);
+    void actTabDeveloper(bool checked);
 
     void openTabVisualDeckStorage();
     void openTabHome();
@@ -218,6 +221,7 @@ private slots:
     void openTabCardArtRules();
     void openTabLog();
     void openTabReport();
+    void openTabDeveloper();
 
     void updateCurrent(int index);
     void updatePingTime(int value, int max);