fix: Instagram 热点过滤低互动内容并按点赞数排序

- 适配器过滤 like_count < 100 的低质量内容，按点赞数降序排列
- 后端 dev/start 脚本添加 --env-file=.env 自动加载环境变量

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

packages/backend/package.json

@@ -4,8 +4,8 @@
   "private": true,
   "type": "module",
   "scripts": {
-    "dev": "tsx watch src/index.ts",
-    "start": "tsx src/index.ts",
+    "dev": "tsx watch --env-file=.env src/index.ts",
+    "start": "tsx --env-file=.env src/index.ts",
     "test": "vitest run",
     "test:watch": "vitest",
     "test:coverage": "vitest run --coverage"

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,

packages/backend/src/lib/adapters/instagram.test.ts

@@ -58,7 +58,7 @@ describe("InstagramAdapter", () => {
                     code: "SEC001",
                     caption: "Section post",
                     user: { username: "user1" },
-                    like_count: 1000,
+                    like_count: 5000,
                   },
                 ],
               },
@@ -87,6 +87,7 @@ describe("InstagramAdapter", () => {
             code: "cap-obj",
             caption: { text: "Caption from object" },
             user: { username: "test" },
+            like_count: 500,
           },
         ],
       });
@@ -102,6 +103,7 @@ describe("InstagramAdapter", () => {
             code: "cap-str",
             caption: "String caption",
             user: { username: "test" },
+            like_count: 500,
           },
         ],
       });
@@ -117,6 +119,7 @@ describe("InstagramAdapter", () => {
             code: "cap-null",
             caption: null,
             user: { username: "test" },
+            like_count: 500,
           },
         ],
       });
@@ -132,6 +135,7 @@ describe("InstagramAdapter", () => {
             code: "thumb-test",
             thumbnail_url: "https://ig.com/thumb.jpg",
             user: { username: "test" },
+            like_count: 500,
           },
         ],
       });
@@ -139,6 +143,22 @@ describe("InstagramAdapter", () => {
       const items = await adapter.fetchTrending(20);
       expect(items[0].cover_url).toBe("https://ig.com/thumb.jpg");
     });
+
+    it("filters out low-engagement items and sorts by likes", async () => {
+      mockFetch.mockResolvedValueOnce({
+        items: [
+          { code: "low", caption: "Low", user: { username: "a" }, like_count: 5 },
+          { code: "high", caption: "High", user: { username: "b" }, like_count: 10000 },
+          { code: "mid", caption: "Mid", user: { username: "c" }, like_count: 500 },
+          { code: "none", caption: "None", user: { username: "d" } },
+        ],
+      });
+
+      const items = await adapter.fetchTrending(20);
+      expect(items).toHaveLength(2);
+      expect(items[0].id).toBe("high");
+      expect(items[1].id).toBe("mid");
+    });
   });
 
   describe("fetchDetail", () => {

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

@@ -34,10 +34,12 @@ export class InstagramAdapter implements PlatformAdapter {
     }
 
     return items
-      .slice(0, count)
       .map((item: unknown, index: number) =>
         this.mapToContentItem(item as Record<string, unknown>, index)
-      );
+      )
+      .filter((item) => item.like_count != null && item.like_count >= 100)
+      .sort((a, b) => (b.like_count ?? 0) - (a.like_count ?? 0))
+      .slice(0, count);
   }
 
   async fetchDetail(id: string): Promise<ContentItem> {

packages/frontend/src/components/card/ContentCard.tsx

@@ -35,6 +35,7 @@ export function ContentCard({ item }: ContentCardProps) {
             alt={item.title}
             fill
             unoptimized
+            referrerPolicy="no-referrer"
             className="object-cover"
             loading="lazy"
             sizes="(max-width: 640px) 100vw, (max-width: 960px) 50vw, (max-width: 1240px) 33vw, 25vw"
@@ -84,6 +85,7 @@ export function ContentCard({ item }: ContentCardProps) {
               width={20}
               height={20}
               unoptimized
+              referrerPolicy="no-referrer"
               className="rounded-full object-cover"
               onError={(e) => {
                 (e.target as HTMLImageElement).style.display = "none";

packages/frontend/src/components/detail/DetailPanel.tsx

@@ -46,6 +46,7 @@ export function DetailPanel({ item }: DetailPanelProps) {
             alt={item.title}
             fill
             unoptimized
+            referrerPolicy="no-referrer"
             className="object-cover"
             priority
             sizes="(max-width: 768px) 100vw, 768px"
@@ -87,6 +88,7 @@ export function DetailPanel({ item }: DetailPanelProps) {
               width={40}
               height={40}
               unoptimized
+              referrerPolicy="no-referrer"
               className="rounded-full object-cover"
               onError={(e) => {
                 (e.target as HTMLImageElement).style.display = "none";