feat: 题材列表盘中120s缓存共用，题材详情新增全量新闻分页+强度热度行情

- 题材热点与热点穿透共用题材列表缓存：盘中由"不缓存实时拉取"改为120s短缓存，
  东财全量列表拉取降到每120s一次，图重建时涨幅/热度两榜直接命中缓存
- 详情页相关新闻升级为全量分页(getThemeRelatedNews)：支持翻页+评论数，
  替换原 getDetail 固定3条
- 详情页统计条新增强度+热度(getSingleThemeQuote)实时指标

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

src/lib/theme-api.ts

@@ -159,6 +159,75 @@ export async function fetchThemeStocks(themeCode: string): Promise<ThemeStocksRe
   }
 }
 
+/* ── 题材相关新闻（分页） ── */
+
+export interface ThemeNewsItem {
+  newsCode: string;
+  newsTitle: string;
+  newsMediaName: string;
+  showDateTime: number | null;
+  showDateTimeFormat: string | null;
+  commentCount: number;
+  themeCode: string;
+  themeName: string;
+}
+
+export interface ThemeNewsResponse {
+  total: number;
+  maxEuTime: string;
+  list: ThemeNewsItem[];
+}
+
+/**
+ * 获取题材相关新闻（分页，maxEuTime 为翻页游标）
+ */
+export async function fetchThemeNews(
+  themeCode: string,
+  pageNum: number = 1,
+  pageSize: number = 10,
+  maxEuTime: string = "",
+): Promise<ThemeNewsResponse | null> {
+  const baseUrl = getApiBaseUrl();
+  const url = `${baseUrl}/api/themes/${themeCode}/news?page_num=${pageNum}&page_size=${pageSize}&max_eu_time=${encodeURIComponent(maxEuTime)}`;
+
+  try {
+    const resp = await fetch(url, { method: "GET", cache: "no-store" });
+    if (!resp.ok) return null;
+    const result = await resp.json();
+    return result.data || null;
+  } catch (err) {
+    console.error("[theme-api] 获取题材新闻失败:", err);
+    return null;
+  }
+}
+
+/* ── 单题材实时行情（强度/热度/涨幅） ── */
+
+export interface ThemeQuote {
+  strengthValue: number | null;
+  hotValueUpLimit: number;
+  hotValue: number;
+  f3: number | null;
+}
+
+/**
+ * 获取单题材实时行情
+ */
+export async function fetchThemeQuote(themeCode: string): Promise<ThemeQuote | null> {
+  const baseUrl = getApiBaseUrl();
+  const url = `${baseUrl}/api/themes/${themeCode}/quote`;
+
+  try {
+    const resp = await fetch(url, { method: "GET", cache: "no-store" });
+    if (!resp.ok) return null;
+    const result = await resp.json();
+    return result.data || null;
+  } catch (err) {
+    console.error("[theme-api] 获取题材行情失败:", err);
+    return null;
+  }
+}
+
 /* ── 热点穿透：题材-股票 网状关系图 ── */
 
 export interface GraphTheme {