add hub instance info (#869)

- Improvement: Hub module listing now includes per-instance process metrics (memory, CPU time, working set, pagefile usage)
- Improvement: Hub now monitors provisioned instance health in the background and refreshes process metrics periodically
- Improvement: Hub no longer exposes raw `StorageServerInstance` pointers to callers; instance state is returned as value snapshots (`Hub::InstanceInfo`)
- Improvement: Hub instance access is now guarded by RAII per-instance locks (`SharedLockedPtr`/`ExclusiveLockedPtr`), preventing concurrent modifications during provisioning and deprovisioning
- Improvement: Hub instance lifecycle is now tracked as a `HubInstanceState` enum covering transitional states (Provisioning, Deprovisioning, Hibernating, Waking); exposed as a string in the HTTP API and dashboard

2 files changed, 15 insertions, 14 deletions

diff --git a/src/zenutil/include/zenutil/zenserverprocess.h b/src/zenutil/include/zenutil/zenserverprocess.h
index 5528b766c..308ae0ef2 100644
--- a/src/zenutil/include/zenutil/zenserverprocess.h
+++ b/src/zenutil/include/zenutil/zenserverprocess.h
@@ -115,22 +115,23 @@ struct ZenServerInstance
 	ZenServerInstance(ZenServerEnvironment& TestEnvironment, ServerMode Mode = ServerMode::kStorageServer);
 	~ZenServerInstance();
 
-	int				   Shutdown();
-	bool			   SignalShutdown(std::error_code& OutEc);
-	uint16_t		   WaitUntilReady();
-	[[nodiscard]] bool WaitUntilReady(int Timeout);
-	[[nodiscard]] bool WaitUntilExited(int Timeout, std::error_code& OutEc);
-	void			   EnableTermination() { m_Terminate = true; }
-	void			   EnableShutdownOnDestroy() { m_ShutdownOnDestroy = true; }
-	void			   DisableShutdownOnDestroy() { m_ShutdownOnDestroy = false; }
-	void			   Detach();
-	inline int		   GetPid() const { return m_Process.Pid(); }
-	inline void		   SetOwnerPid(int Pid) { m_OwnerPid = Pid; }
-	void*			   GetProcessHandle() const { return m_Process.Handle(); }
+	int					 Shutdown();
+	bool				 SignalShutdown(std::error_code& OutEc);
+	uint16_t			 WaitUntilReady();
+	[[nodiscard]] bool	 WaitUntilReady(int Timeout);
+	[[nodiscard]] bool	 WaitUntilExited(int Timeout, std::error_code& OutEc);
+	void				 EnableTermination() { m_Terminate = true; }
+	void				 EnableShutdownOnDestroy() { m_ShutdownOnDestroy = true; }
+	void				 DisableShutdownOnDestroy() { m_ShutdownOnDestroy = false; }
+	void				 Detach();
+	inline int			 GetPid() const { return m_Process.Pid(); }
+	inline void			 SetOwnerPid(int Pid) { m_OwnerPid = Pid; }
+	const ProcessHandle& GetProcessHandle() const { return m_Process; }
+
 #if ZEN_PLATFORM_WINDOWS
 	void SetJobObject(JobObject* Job) { m_JobObject = Job; }
 #endif
-	bool		IsRunning();
+	bool		IsRunning() const;
 	bool		Terminate();
 	std::string GetLogOutput() const;
 
diff --git a/src/zenutil/zenserverprocess.cpp b/src/zenutil/zenserverprocess.cpp
index ebce9730e..8eaf2cf5b 100644
--- a/src/zenutil/zenserverprocess.cpp
+++ b/src/zenutil/zenserverprocess.cpp
@@ -1419,7 +1419,7 @@ ZenServerInstance::SetDataDir(std::filesystem::path TestDir)
 }
 
 bool
-ZenServerInstance::IsRunning()
+ZenServerInstance::IsRunning() const
 {
 	if (!m_Process.IsValid())
 	{