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>

src/installer/main.ts

@@ -155,11 +155,11 @@ ipcMain.handle('packs:load', async (_event, manifestUrlInput?: string): Promise<
 })
 
 // 약관(Markdown) 을 사이트(/manifest/terms/<packKey>/<kind>.md) 에서 받아와 그대로 돌려준다.
-// 화이트리스트로 5종 제한. pack 미선택 상태에서는 에러를 돌려준다. 네트워크 실패 시 에러 메시지가 그대로 화면에 노출된다.
-const TERM_KIND_WHITELIST = new Set(['map', 'resourcepack', 'mod', 'installer', 'installer-rp'])
+// v0.3.4~ : 사이트에서 임의 kind 등록 가능 → 하드코딩 5종 화이트리스트 대신 kind 형식만 검증.
+const TERM_KIND_RE = /^[a-z0-9][a-z0-9-]{0,31}$/
 ipcMain.handle('terms:get', async (_event, kind: string): Promise<{ ok: boolean; content?: string; message?: string }> => {
-  if (!TERM_KIND_WHITELIST.has(kind)) {
-    return { ok: false, message: 'unknown term kind' }
+  if (typeof kind !== 'string' || !TERM_KIND_RE.test(kind)) {
+    return { ok: false, message: 'invalid term kind' }
   }
   if (!state.selectedKey) {
     return { ok: false, message: 'pack not selected' }
@@ -173,6 +173,31 @@ ipcMain.handle('terms:get', async (_event, kind: string): Promise<{ ok: boolean;
   }
 })
 
+// 메인 인스톨러용 약관 목록. /manifest/terms/<packKey>/index.json 을 받아
+// showInInstaller=true 인 항목만 추려 반환. 비어 있으면 렌더러가 약관 단계를 건너뛴다.
+ipcMain.handle('terms:list', async (): Promise<{ ok: boolean; terms?: Array<{ kind: string; label: string }>; message?: string }> => {
+  if (!state.selectedKey) return { ok: false, message: 'pack not selected' }
+  try {
+    const url = `${state.baseUrl}/manifest/terms/${encodeURIComponent(state.selectedKey)}/index.json`
+    const buf = await fetchBuffer(url)
+    const parsed = JSON.parse(buf.toString('utf8')) as { terms?: unknown }
+    const items = Array.isArray(parsed.terms) ? parsed.terms : []
+    const terms: Array<{ kind: string; label: string }> = []
+    for (const it of items) {
+      if (!it || typeof it !== 'object') continue
+      const entry = it as Record<string, unknown>
+      if (entry.showInInstaller !== true) continue
+      const kind = typeof entry.kind === 'string' ? entry.kind : ''
+      const label = typeof entry.label === 'string' ? entry.label : ''
+      if (!TERM_KIND_RE.test(kind) || label.length === 0) continue
+      terms.push({ kind, label })
+    }
+    return { ok: true, terms }
+  } catch (error) {
+    return { ok: false, message: (error as Error).message }
+  }
+})
+
 ipcMain.handle('packs:select', async (_event, packKey: string) => {
   if (!state.packs.has(packKey)) {
     throw new Error(t('errors.packNotFound'))