fix: 修复相册缩略图无法显示(dev 代理 + 前端兜底)

- vite: /uploads 代理指向源站根而非 /apnew 前缀,relative thumbnailUrl
  (/uploads/thumb…) 在 dev 下不再落到 SPA index.html
- BubbleImage: 新增 fallbackSrc 候选链,缩略图加载失败时自动回退到绝对
  thumbUrl/url,全部失败才显示占位符
- AlbumBubble / ImageLightbox: 缩略图传入绝对地址作为兜底

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

vite.config.ts

@@ -4,6 +4,17 @@ import react from "@vitejs/plugin-react";
 export default defineConfig(({ mode }) => {
   const env = loadEnv(mode, process.cwd(), "");
   const apiProxyTarget = env.DEV_API_PROXY_TARGET || "http://127.0.0.1:8080";
+  // Uploaded assets (thumbnails etc.) are served from the site root, NOT under
+  // the API's /apnew prefix. Proxy /uploads to the origin root so relative
+  // thumbnailUrls like "/uploads/thumb52-….jpg" resolve to a real image in dev
+  // instead of falling through to the SPA's index.html.
+  const uploadsProxyTarget = (() => {
+    try {
+      return new URL(apiProxyTarget).origin;
+    } catch {
+      return apiProxyTarget;
+    }
+  })();
 
   return {
     plugins: [react()],
@@ -26,7 +37,7 @@ export default defineConfig(({ mode }) => {
           rewrite: (path) => path.replace(/^\/apnew/, ""),
         },
         "/api": { target: apiProxyTarget, changeOrigin: true },
-        "/uploads": { target: apiProxyTarget, changeOrigin: true },
+        "/uploads": { target: uploadsProxyTarget, changeOrigin: true },
       },
     },
   };