terms: per-term installer visibility toggles + universal delete (v0.3.4)

- _meta.json: customLabels -> terms.{label,showInInstaller,showInInstallerRp}
- Drop builtin protection; any term kind can be deleted/added/toggled
- New public route /manifest/terms/<pack>/index.json for installer term lists
- Installers fetch terms:list dynamically; skip agreement step if list empty
- Term editor: 2 visibility checkboxes (설치기 / 리소스팩 설치기), multi-select
- Migration from old schema preserves custom labels (default: visible in both)

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

installer-rp/renderer.js

@@ -141,14 +141,36 @@ function renderStep1() {
 }
 
 // 약관 동의 페이지: 1단계 직후, 2단계 설치 진입 전에 노출.
-// rp 인스톨러는 리소스팩·설치기 두 약관만 확인·동의하면 된다.
+// v0.3.4~ : 사이트의 visibility 토글에 따라 표시할 약관이 결정된다. 목록이 비면 단계를 건너뛴다.
 function renderAgreement() {
   setActiveStep(1)
   clearPage()
-  var KINDS = [
-    { id: 'resourcepack', tab: tt('agreement.tabResourcepack') },
-    { id: 'installer-rp', tab: tt('agreement.tabInstaller') }
-  ]
+  var loadingSection = document.createElement('section')
+  loadingSection.className = 'page'
+  loadingSection.innerHTML = '<h2>' + escapeHtml(tt('agreement.heading')) + '</h2>' +
+    '<p class="formMessage">' + escapeHtml(tt('agreement.loading')) + '</p>'
+  pageHost.appendChild(loadingSection)
+
+  api.getTermsList().then(function (res) {
+    if (!res || !res.ok) {
+      renderStep2()
+      return
+    }
+    var terms = (res.terms || []).map(function (t) {
+      return { id: t.kind, tab: t.label }
+    })
+    if (terms.length === 0) {
+      renderStep2()
+      return
+    }
+    clearPage()
+    renderAgreementWithKinds(terms)
+  }).catch(function () {
+    renderStep2()
+  })
+}
+
+function renderAgreementWithKinds(KINDS) {
   var section = document.createElement('section')
   section.className = 'page'
   section.innerHTML =