feat(admin): add getDashboardData query

src/data/content.ts

@@ -1,9 +1,10 @@
-import { and, asc, desc, eq, ne } from "drizzle-orm";
+import { and, asc, desc, eq, isNull, ne, sql } from "drizzle-orm";
 import type { DrizzleD1Database } from "drizzle-orm/d1";
 import {
   blogKeywords,
   cases,
   contentItems,
+  CONTENT_KINDS,
   posts,
   siteSettings,
   type BlogKeyword,
@@ -71,6 +72,53 @@ export async function getKeywords(db: Db): Promise<BlogKeyword[]> {
     .orderBy(asc(blogKeywords.createdAt), asc(blogKeywords.id));
 }
 
+export type DashboardData = {
+  posts: { published: number; draft: number };
+  cases: { published: number; draft: number };
+  content: { kind: ContentKind; published: number; draft: number }[];
+  keywords: { pending: number; generated: number; skipped: number };
+  recentPosts: Post[];
+  postsWithoutCover: number;
+};
+
+/** 後台總覽用嘅統計（只讀 DB；AI secrets 由頁面層提供）。 */
+export async function getDashboardData(db: Db): Promise<DashboardData> {
+  const [postRows, caseRows, itemRows, kwRows, recentPosts, noCover] = await Promise.all([
+    db.select({ status: posts.status, n: sql<number>`count(*)` }).from(posts).groupBy(posts.status),
+    db.select({ status: cases.status, n: sql<number>`count(*)` }).from(cases).groupBy(cases.status),
+    db
+      .select({ kind: contentItems.kind, status: contentItems.status, n: sql<number>`count(*)` })
+      .from(contentItems)
+      .groupBy(contentItems.kind, contentItems.status),
+    db
+      .select({ status: blogKeywords.status, n: sql<number>`count(*)` })
+      .from(blogKeywords)
+      .groupBy(blogKeywords.status),
+    db.select().from(posts).orderBy(desc(posts.updatedAt)).limit(5),
+    db.select({ n: sql<number>`count(*)` }).from(posts).where(isNull(posts.coverImage)),
+  ]);
+
+  const pick = <T extends string>(rows: { status: T; n: number }[], status: T) =>
+    Number(rows.find((r) => r.status === status)?.n ?? 0);
+
+  return {
+    posts: { published: pick(postRows, "published"), draft: pick(postRows, "draft") },
+    cases: { published: pick(caseRows, "published"), draft: pick(caseRows, "draft") },
+    content: CONTENT_KINDS.map((kind) => ({
+      kind,
+      published: Number(itemRows.find((r) => r.kind === kind && r.status === "published")?.n ?? 0),
+      draft: Number(itemRows.find((r) => r.kind === kind && r.status === "draft")?.n ?? 0),
+    })),
+    keywords: {
+      pending: pick(kwRows, "pending"),
+      generated: pick(kwRows, "generated"),
+      skipped: pick(kwRows, "skipped"),
+    },
+    recentPosts,
+    postsWithoutCover: Number(noCover[0]?.n ?? 0),
+  };
+}
+
 export async function getHomeData(db: Db): Promise<HomeData> {
   const [settings, services, features, steps, faqs, caseList] = await Promise.all([
     getSettings(db),