Dashboard overhaul, compute integration (#814)

- **Frontend dashboard overhaul**: Unified compute/main dashboards into a single shared UI. Added new pages for cache, projects, metrics, sessions, info (build/runtime config, system stats). Added live-update via WebSockets with pause control, sortable detail tables, themed styling. Refactored compute/hub/orchestrator pages into modular JS.
- **HTTP server fixes and stats**: Fixed http.sys local-only fallback when default port is in use, implemented root endpoint redirect for http.sys, fixed Linux/Mac port reuse. Added /stats endpoint exposing HTTP server metrics (bytes transferred, request rates). Added WebSocket stats tracking.
- **OTEL/diagnostics hardening**: Improved OTLP HTTP exporter with better error handling and resilience. Extended diagnostics services configuration.
- **Session management**: Added new sessions service with HTTP endpoints for registering, updating, querying, and removing sessions. Includes session log file support. This is still WIP.
- **CLI subcommand support**: Added support for commands with subcommands in the zen CLI tool, with improved command dispatch.
- **Misc**: Exposed CPU usage/hostname to frontend, fixed JS compact binary float32/float64 decoding, limited projects displayed on front page to 25 sorted by last access, added vscode:// link support.

Also contains some fixes from TSAN analysis.

1 files changed, 9 insertions, 3 deletions

diff --git a/src/zenserver/storage/workspaces/httpworkspaces.cpp b/src/zenserver/storage/workspaces/httpworkspaces.cpp
index dc4cc7e69..785dd62f0 100644
--- a/src/zenserver/storage/workspaces/httpworkspaces.cpp
+++ b/src/zenserver/storage/workspaces/httpworkspaces.cpp
@@ -110,8 +110,8 @@ HttpWorkspacesService::HandleRequest(HttpServerRequest& Request)
 	}
 }
 
-void
-HttpWorkspacesService::HandleStatsRequest(HttpServerRequest& HttpReq)
+CbObject
+HttpWorkspacesService::CollectStats()
 {
 	ZEN_TRACE_CPU("WorkspacesService::Stats");
 	CbObjectWriter Cbo;
@@ -150,7 +150,13 @@ HttpWorkspacesService::HandleStatsRequest(HttpServerRequest& HttpReq)
 	}
 	Cbo.EndObject();
 
-	return HttpReq.WriteResponse(HttpResponseCode::OK, Cbo.Save());
+	return Cbo.Save();
+}
+
+void
+HttpWorkspacesService::HandleStatsRequest(HttpServerRequest& HttpReq)
+{
+	HttpReq.WriteResponse(HttpResponseCode::OK, CollectStats());
 }
 
 void