feat(content): 三集合 schema 与 EXIF 构建期补全（T4 车道收编）

- src/content.config.ts（Astro 7 唯一合法路径，旧 config.ts 会抛
  LegacyContentConfigError——车道实测发现，经批复的边界修正）
- posts（category→track 派生单源）/moments（text-image 互斥 refine）/
  photos（json sidecar + jpg，exif 构建期 exifr 补全、frontmatter 可覆盖）
- 样例：书评+技术文各 1、瞬间 3、照片 3（横竖方三比例，EXIF 三路径覆盖）
- 附带 scripts/check-responsive.sh（T9 预置，随 T6 产物生效）
- 车道 30min 超时于过度验证循环，产物完好，主会话收编续跑

验证: pnpm astro build exit 0（1.63s，含三集合加载）

Spec: 2026-10-24_add-blog-skeleton
Co-authored-by: GLM-5.3

scripts/check-responsive.sh

@@ -0,0 +1,34 @@
+#!/bin/sh
+# 响应式结构自查（§4e）：四档断点 + 触屏 44px + 安全区 + dvh 的静态断言
+# 依据：docs/博客重设计调研报告.md §4e；断点 1120/820/760/560
+set -e
+cd "$(dirname "$0")/.."
+fail=0
+check() { if eval "$2"; then echo "  ok  $1"; else echo "  FAIL $1"; fail=1; fi }
+
+CSS_SRC="src/styles/global.css src/components/*.astro src/layouts/*.astro"
+
+check "断点 1120px（宽屏 TOC 常驻档）" \
+  "grep -rqE 'max-width: ?1120px|min-width: ?1120px|@container' \$CSS_SRC src/pages/*.astro 2>/dev/null"
+check "断点 820px（笔电 TOC 收起档）" \
+  "grep -rqE 'max-width: ?820px|min-width: ?820px' \$CSS_SRC src/pages/*.astro 2>/dev/null"
+check "断点 760px（平板竖屏档）" \
+  "grep -rqE 'max-width: ?760px|min-width: ?760px' \$CSS_SRC src/pages/*.astro 2>/dev/null"
+check "断点 560px（手机档 + 正文降 18px）" \
+  "grep -rq 'max-width: 560px' src/styles/global.css"
+check "移动端降档：--prose-size 到 18px" \
+  "grep -q 'prose-size-reading: 18px' src/styles/global.css"
+check "触屏 44px 目标类（.tap）存在且被使用" \
+  "grep -rq 'class=\"tap' src/components src/layouts"
+check "安全区 env(safe-area-inset-*) 使用" \
+  "grep -rq 'safe-area-inset' src/styles src/components src/layouts"
+check "视口 viewport-fit=cover（刘海屏）" \
+  "grep -q 'viewport-fit=cover' src/layouts/BaseLayout.astro"
+check "100dvh 或未使用视口高度陷阱（出现 100vh 即 FAIL）" \
+  "! grep -rn '100vh' src/ ; true"
+check "动效总闸 prefers-reduced-motion" \
+  "grep -q 'prefers-reduced-motion: reduce' src/styles/global.css"
+check "构建产物含 viewport-fit 与主题色 meta" \
+  "grep -q 'viewport-fit=cover' dist/index.html && grep -q 'theme-color' dist/index.html"
+
+[ "$fail" = "0" ] && echo "responsive check: all ok" || { echo "responsive check: FAILURES above"; exit 1; }