feat(admin-web): expose AI point balance and usage ledger

Surfaces the new AI point quota in the workspace shell and adds a
Personal Center → AI Point Usage page that shows balance, base-char
rule, and the paginated reservation/refund history. Updates shared
types for the QuotaSummary and ledger payloads.

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

apps/admin-web/src/lib/api.ts

@@ -7,6 +7,7 @@ import type {
   ArticleListResponse,
   CreateArticleRequest,
   ArticleVersion,
+  AIPointUsageListResponse,
   GenerateImitationRequest,
   GenerateImitationResponse,
   AuthTokens,
@@ -293,6 +294,9 @@ export const workspaceApi = {
   quotaSummary() {
     return apiClient.get<QuotaSummary>("/api/tenant/workspace/quota-summary");
   },
+  aiPointUsage(params?: { page?: number; page_size?: number; limit?: number; offset?: number }) {
+    return apiClient.get<AIPointUsageListResponse>("/api/tenant/workspace/ai-point-usage", { params });
+  },
   templateCards() {
     return apiClient.get<TemplateCard[]>("/api/tenant/workspace/template-cards");
   },