v0.143.0 — guest RAM resize UI (R-24) — MinAgent: 0.90.0

The customer sees the guest's current memory + allowed range on the Rendszer settings
page and resizes it. The controller proxies + maps the agent's machine code to Hungarian;
the agent (felhom-agent v0.90.0) enforces every bound and applies live (no reboot).

agentapi: GuestMemory + ResizeMemory; ruled 412 -> *MemoryRefusedError (code+bounds);
pre-0.90 agent 404 -> typed *StatusError. Capability: FeatureGuestMemoryResize +
featureMinAgent 0.90.0 + a featureProbes row (type-asserts GuestMemory so the shared
SupportProber/netAgent are untouched).

UI (internal/web/system_memory_handlers.go, settings_system.html): "Szerver memoria (RAM)"
card + number input; POST /api/system/memory/resize -> capability gate -> agent -> flash.
JS confirm only on shrink. Code->Hungarian map; agent-outdated hides the control;
agent-unreachable falls back to the guest's /proc/meminfo. Agent English never shown raw.

Tests: agentapi (decode, 404, refusal-code, capability table) + web handler (success/
below_usage_floor/agent_outdated). Gates + go build/vet/test all pass.

controller/internal/web/handlers.go

@@ -1198,6 +1198,8 @@ func (s *Server) systemPageData() map[string]interface{} {
 		// to. Empty = none set by the operator.
 		data["ControllerFloor"] = s.updater.GetFloor()
 	}
+	// Guest RAM resize card (v0.143.0, R-24): current allocation + bounds + capability/reachability.
+	s.memoryCardData(data)
 	return data
 }