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Hungarian map; agent-outdated hides the control;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/templates/settings_system.html

@@ -143,6 +143,48 @@
     </div>
 </div>
 
+<div class="settings-card">
+    <h3>Szerver memória (RAM)</h3>
+    {{if .MemorySupported}}
+    {{if .MemoryReachable}}
+    <div class="settings-grid">
+        <div class="settings-row">
+            <span class="settings-label">Jelenlegi memória</span>
+            <span class="settings-value mono">{{.MemoryAllocatedMB}} MB</span>
+        </div>
+        <div class="settings-row">
+            <span class="settings-label">Felhasznált</span>
+            <span class="settings-value mono">{{.MemoryUsageMB}} MB</span>
+        </div>
+        <div class="settings-row">
+            <span class="settings-label">Megengedett tartomány</span>
+            <span class="settings-value mono">{{.MemoryMinMB}} MB – {{.MemoryMaxMB}} MB</span>
+        </div>
+        <div class="settings-row" style="padding-top: 0.5em;">
+            <span class="settings-label">Új méret (MB)</span>
+            <span class="settings-value">
+                <input type="number" id="mem-input" class="input mono" style="width:8em;"
+                       value="{{.MemoryAllocatedMB}}" min="{{.MemoryMinMB}}" max="{{.MemoryMaxMB}}" step="256"
+                       data-current="{{.MemoryAllocatedMB}}">
+                <button class="btn btn-primary btn-sm" id="btn-mem-resize" onclick="resizeMemory()" style="margin-left:0.5em;">Átméretezés</button>
+                <span id="mem-status-msg" style="margin-left:0.5em; display:none;"></span>
+            </span>
+        </div>
+    </div>
+    {{else}}
+    <div class="settings-grid">
+        <div class="settings-row">
+            <span class="settings-label">Jelenlegi memória</span>
+            <span class="settings-value mono">{{if .MemoryProcMB}}{{.MemoryProcMB}} MB{{else}}n/a{{end}}</span>
+        </div>
+    </div>
+    <p class="settings-card-desc">A kiszolgáló ügynök jelenleg nem elérhető — próbáld meg később.</p>
+    {{end}}
+    {{else}}
+    <p class="settings-card-desc">A memória átméretezéséhez a kiszolgáló rendszerfrissítése szükséges.</p>
+    {{end}}
+</div>
+
 <div id="dialog-root"></div>
 <script>
 // Light overlay dialog (D1) — replaces the native blocking browser dialogs (same texts).
@@ -220,6 +262,55 @@ function doTriggerUpdate() {
         });
 }
 
+function resizeMemory() {
+    var input = document.getElementById('mem-input');
+    var target = parseInt(input.value, 10);
+    var current = parseInt(input.getAttribute('data-current'), 10);
+    if (isNaN(target) || target <= 0) {
+        showMemMsg('Érvénytelen memória érték', true);
+        return;
+    }
+    if (target < current) {
+        openDialog({title:'Memória csökkentése', confirmLabel:'Csökkentés',
+            message:'A memória csökkentése hatással lehet a futó alkalmazások teljesítményére. Biztosan folytatod?',
+            onConfirm:function(){ doResizeMemory(target); }});
+        return;
+    }
+    doResizeMemory(target);
+}
+function doResizeMemory(target) {
+    var btn = document.getElementById('btn-mem-resize');
+    btn.disabled = true;
+    btn.textContent = 'Átméretezés...';
+    fetch('/api/system/memory/resize', {
+        method:'POST', headers: Object.assign({'Content-Type':'application/json'}, csrfHeaders()),
+        body: JSON.stringify({memory_mb: target})
+    })
+    .then(function(r) { return r.json(); })
+    .then(function(data) {
+        if (data.ok) {
+            showMemMsg(data.error || data.message || 'Kész.', false);
+            setTimeout(function(){ location.reload(); }, 1200);
+        } else {
+            showMemMsg(data.error || 'A művelet nem sikerült', true);
+            btn.disabled = false;
+            btn.textContent = 'Átméretezés';
+        }
+    })
+    .catch(function() {
+        showMemMsg('Kapcsolódási hiba', true);
+        btn.disabled = false;
+        btn.textContent = 'Átméretezés';
+    });
+}
+function showMemMsg(text, isErr) {
+    var msg = document.getElementById('mem-status-msg');
+    if (!msg) return;
+    msg.textContent = text;
+    msg.style.color = isErr ? 'var(--danger, #c0392b)' : 'var(--text-2)';
+    msg.style.display = 'inline';
+}
+
 function pollUntilBack() {
     var iv = setInterval(function() {
         fetch('/api/health')