feat(gallery): 原图查看与下载——仓外 originals store 双轨制

- git 仓只进压缩版（构建用）；原图落 ~/docker_apps/blog/photos-originals/
  （迁移器/ingest 双入口写入，幂等），build.sh 独立 rsync 到
  staging/photos-originals/（同一静态根，零 nginx 改动）
- lightbox 增「原图」（新标签全尺寸）+「下载」（download 属性带文件名）
- 原图持久保障：store + Phase 0 备份 tar 双留档；存量 21 张已回填（196M）

验证: astro build 11 页 exit 0；dist/gallery 含 lb-original×2 与
      photos-originals 引用；staging/photos-originals 21 张实测

Spec: none (用户功能补req：原图查看/下载，跨 Phase 独立小特性)

Co-authored-by: GLM-5.3

infra/deploy/build.sh

@@ -13,5 +13,8 @@ pnpm astro build
 echo "[build] rsync -> $STAGING"
 mkdir -p "$STAGING"
 rsync -a --delete "$REPO_DIR/dist/" "$STAGING/"
+# 原图仓独立同步（不进 git/dist）：/photos-originals/ 供图库"查看原图/下载"
+ORIG="$HOME/docker_apps/blog/photos-originals"
+if [ -d "$ORIG" ]; then rsync -a "$ORIG/" "$STAGING/photos-originals/"; fi
 printf 'built at %s\n' "$(date -Is)" > "$STAGING/.build-stamp"
 echo "[build] done: $(find "$STAGING" -name '*.html' | wc -l) html files"

scripts/migrate/photos_migrate.py

@@ -61,9 +61,11 @@ def main() -> int:
         fname = unquote(url.rsplit("/", 1)[1])
         slug = slugify(spec.get("displayName") or fname)
         data = urllib.request.urlopen(BASE + url, timeout=60).read()
-        # 入仓前压到长边 2400/q86：原图总计 196M（单张最大 28M）会永久膨胀
+        # 原图双留档：仓外 originals store（构建时独立 rsync，服务"查看原图/
-        # 公开仓历史并撞死 nginx 100M 推送上限；原图已随 Phase 0 备份归档，
+        # 下载"）+ Phase 0 备份 tar；git 仓只进压缩版（196M 事故教训）
-        # 站内展示由 sharp 出 srcset，2400px 足够 lightbox 全屏
+        STORE = Path.home() / "docker_apps/blog/photos-originals"
+        STORE.mkdir(parents=True, exist_ok=True)
+        (STORE / f"{slug}.jpg").write_bytes(data)
         (OUT / f"{slug}.jpg").write_bytes(compress(data))
 
         (OUT / f"{slug}.json").write_text(json.dumps({

scripts/photos_ingest.py

@@ -27,6 +27,11 @@ def main() -> int:
         if size < SKIP_BELOW_BYTES:
             skipped += 1
             continue
+        STORE = Path.home() / "docker_apps/blog/photos-originals"
+        STORE.mkdir(parents=True, exist_ok=True)
+        # 压缩覆写仓内文件前原件先进 store（幂等：store 已有同名则跳过）
+        if not (STORE / jpg.name).exists():
+            (STORE / jpg.name).write_bytes(jpg.read_bytes())
         img = Image.open(jpg)
         # EXIF 显式保留：重存默认剥离会抽走图库参数条的构建期数据源
         exif = img.info.get("exif")

src/pages/gallery/index.astro

@@ -47,6 +47,8 @@ const cards = await Promise.all(
       image: photo.data.image,
       exif: formatExif(photo.data.exif),
       fullSrc: full.src,
+      // 原图走仓外 store（构建时独立 rsync 到 /photos-originals/），git 不背 196M
+      original: `/photos-originals/${photo.id}.jpg`,
       w,
       h,
       s3: spanFor(w, h, 3),
@@ -84,6 +86,7 @@ const first = cards[0];
               data-title={card.title}
               data-exif={card.exif}
               data-full={card.fullSrc}
+              data-original={card.original}
               aria-label={`查看大图：${card.title}${card.exif ? `（${card.exif}）` : ''}`}
             >
               <Image
@@ -119,6 +122,10 @@ const first = cards[0];
       <div class="lb-meta">
         <strong id="lb-title">{first?.title}</strong>
         <span id="lb-exif">{first?.exif}</span>
+        <span class="lb-orig">
+          <a id="lb-original" href={first?.original} target="_blank" rel="noopener">原图</a>
+          <a id="lb-download" href={first?.original} download>下载</a>
+        </span>
       </div>
       <button id="lb-next" class="tap lbnav" type="button" aria-label="下一张（→）">
         <svg viewBox="0 0 24 24" width="15" height="15" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true">
@@ -150,6 +157,11 @@ const first = cards[0];
       img.alt = btn.ariaLabel ?? '';
       titleEl.textContent = btn.dataset.title ?? '';
       exifEl.textContent = btn.dataset.exif ?? '';
+      const orig = btn.dataset.original ?? '';
+      (document.getElementById('lb-original') as HTMLAnchorElement).href = orig;
+      const dl = document.getElementById('lb-download') as HTMLAnchorElement;
+      dl.href = orig;
+      dl.setAttribute('download', btn.dataset.title ?? 'photo');
       if (!reduced.matches) {
         img.style.opacity = '0';
         requestAnimationFrame(() => {
@@ -315,6 +327,18 @@ const first = cards[0];
     font-family: var(--font-mono);
     font-size: 12.5px;
   }
+  .lb-orig {
+    display: inline-flex;
+    gap: var(--space-3);
+    margin-left: var(--space-2);
+  }
+  .lb-orig a {
+    font-family: var(--font-mono);
+    font-size: 12px;
+    color: var(--accent);
+    text-decoration: underline;
+    text-underline-offset: 0.2em;
+  }
   .lb-meta {
     flex: 1;
     min-width: 0;
@@ -352,6 +376,18 @@ const first = cards[0];
   }
   @media (max-width: 560px) {
     .lb-bottom { flex-wrap: wrap; }
+    .lb-orig {
+    display: inline-flex;
+    gap: var(--space-3);
+    margin-left: var(--space-2);
+  }
+  .lb-orig a {
+    font-family: var(--font-mono);
+    font-size: 12px;
+    color: var(--accent);
+    text-decoration: underline;
+    text-underline-offset: 0.2em;
+  }
   .lb-meta { order: 3; flex-basis: 100%; }
   }
 </style>