fix: 修复哔哩哔哩平台封面图无法显示的问题

- 后端 Bilibili 适配器添加 URL 规范化，处理协议相对路径和 http 协议
- 前端 Image 组件添加 referrerPolicy="no-referrer" 绕过 CDN 防盗链

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

packages/backend/src/lib/adapters/bilibili.ts

@@ -1,6 +1,13 @@
 import type { ContentItem, PlatformAdapter } from "@muse/shared";
 import { tikhubFetch } from "../tikhub";
 
+/** Ensure Bilibili URLs use https:// (API may return protocol-relative "//..." or http) */
+function normalizeUrl(url: string): string {
+  if (url.startsWith("//")) return `https:${url}`;
+  if (url.startsWith("http://")) return url.replace("http://", "https://");
+  return url;
+}
+
 export class BilibiliAdapter implements PlatformAdapter {
   async fetchTrending(count: number): Promise<ContentItem[]> {
     // eslint-disable-next-line @typescript-eslint/no-explicit-any
@@ -44,10 +51,10 @@ export class BilibiliAdapter implements PlatformAdapter {
     return {
       id: String(aid || bvid),
       title: raw?.title || "无标题",
-      cover_url: raw?.pic || undefined,
+      cover_url: raw?.pic ? normalizeUrl(raw.pic) : undefined,
       video_url: undefined,
       author_name: owner?.name || raw?.author || "未知作者",
-      author_avatar: owner?.face || undefined,
+      author_avatar: owner?.face ? normalizeUrl(owner.face) : undefined,
       play_count: stat?.view ?? undefined,
       like_count: stat?.like ?? undefined,
       collect_count: stat?.favorite ?? undefined,