feat: public platform, admin console, templates, landing docs

Projects become publicly browsable after admin approval; management and
secret-adjacent reads (logs, variables, exec, connection URLs) require
owner/member/admin auth, and platform controls sit behind RequireAdmin.

- Backend: OptionalAuth middleware, read/authed/admin route groups,
  projects.is_approved + service_templates.owner_id migration,
  visibility-aware sqlc queries, admin overview/users/approval endpoints,
  EnsureAdminAccount bootstrap (ADMIN_* env), 30 seeded templates with
  owner CRUD, managed-database connection URLs gated owner+admin, fix
  DB.Stats() infinite recursion.
- Frontend: expandable persisted sidebar + clickable user menu, public
  landing page with searchable docs browser (GitHub sync, bundled
  snapshot + localStorage fallback), DocsBrowser shared with /docs,
  template create/edit/JSON-upload for owned templates, database create
  dialog, admin console (stats, approvals, project edit/delete, user
  admin toggles), HA/Security/Usage polish with dead CSS tokens mapped
  to real theme vars, anonymous-safe gating on every mutation control.
- Tests: safe window.localStorage access fixes happy-dom crashes in
  PlatformShell and canvas storage.

Generated with [Devin](https://devin.ai)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

app/backend/internal/api/agents.go

@@ -1217,8 +1217,10 @@ func (h *NodeAgentHandler) SetupPublicRoutes(router *gin.RouterGroup) {
 	}
 }
 
-// SetupRoutes registers authenticated dashboard/control agent routes.
-func (h *NodeAgentHandler) SetupRoutes(router *gin.RouterGroup) {
+// SetupAdminRoutes registers dashboard/control agent routes. Command
+// history and container details can leak sensitive output, so these stay
+// admin-only rather than joining the public read group.
+func (h *NodeAgentHandler) SetupAdminRoutes(router *gin.RouterGroup) {
 	tokens := router.Group("/agent-tokens")
 	{
 		tokens.POST("", h.CreateAgentToken)