feat(kol): support multiple platform hints with shared tag renderer

Turn the KOL prompt platform hint into a multi-select backed by the
media platforms API, persist hints as a 、-joined string, and add a
reusable KolPlatformTags component so manage/generate/package/template/
workspace views and the generate-task drawer all render the hints
consistently with truncation and overflow handling.

Also auto-select the first available subscription prompt in
GenerateTaskDrawer when switching to the subscription-prompt target so
users land on a usable option without an extra click.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/admin-web/src/lib/kol-platform-options.ts

@@ -1,13 +1,51 @@
-import { aiPlatformCatalog } from '@geo/shared-types'
+import type { MediaPlatform } from '@geo/shared-types'
 
 export interface KolPlatformOption {
   label: string
   value: string
+  disabled?: boolean
 }
 
-export function buildKolPlatformOptions(defaultLabel: string): KolPlatformOption[] {
-  return [
+export const KOL_PLATFORM_HINT_DEFAULT = '通用'
+
+export function buildKolPlatformOptions(
+  defaultLabel: string,
+  platforms: MediaPlatform[] = [],
+  selectedValues: string[] = [],
+): KolPlatformOption[] {
+  const defaultSelected = selectedValues.includes(KOL_PLATFORM_HINT_DEFAULT)
+  const options = [
     { label: defaultLabel, value: '通用' },
-    ...aiPlatformCatalog.map((item) => ({ label: item.label, value: item.id })),
+    ...platforms.map((item) => ({
+      label: item.name,
+      value: item.name,
+      disabled: defaultSelected,
+    })),
   ]
+  const knownValues = new Set(options.map((item) => item.value))
+  const customOptions = normalizeKolPlatformHints(selectedValues)
+    .filter((value) => !knownValues.has(value))
+    .map((value) => ({ label: value, value }))
+
+  return [...customOptions, ...options]
+}
+
+export function parseKolPlatformHints(value?: string | null): string[] {
+  return normalizeKolPlatformHints(String(value ?? '').split(/[、,，;\n]+/))
+}
+
+export function normalizeKolPlatformHints(values?: Array<string | null | undefined>): string[] {
+  const next = Array.from(
+    new Set((values ?? []).map((item) => String(item ?? '').trim()).filter(Boolean)),
+  )
+
+  if (next.includes(KOL_PLATFORM_HINT_DEFAULT)) {
+    return [KOL_PLATFORM_HINT_DEFAULT]
+  }
+
+  return next
+}
+
+export function serializeKolPlatformHints(values?: Array<string | null | undefined>): string {
+  return normalizeKolPlatformHints(values).join('、')
 }