feat(i18n): T6 真实翻译入仓与 Phase 3 收敛归档

- op-artalk 车道：6/6 篇 TMT 翻译入 posts-en（frontmatter 字节级透传），
  幂等复跑 0 API；修复 TMT 1800+ 字符包静默截断（limit 1600 + ratio
  检测 + 二分降级，mock 三场景）
- 标题首字母抛光；T8 staging 21 页 + rollback 绿 + halo 无恙
- spec_verify --all 八项同指纹 exit=0；check 一次收敛；归档

验证: 21 页 build exit 0；/en/ 文章页真实英文内容渲染
      （Under the Veil… 抽检）；幂等 dry-run 6 skip 0 API

Spec: 2026-10-25_add-blog-i18n
Co-authored-by: GLM-5.3

content/posts-en/.translation-state.json

@@ -0,0 +1,20 @@
+{
+  "posts/csge-lei-pei-zhi.md": {
+    "sha256": "bd23b63a6453829fe3dccd4e261f2e9526917edc5d2fb8e23cac7e7371db140f"
+  },
+  "posts/deng-dai-ge-duo.md": {
+    "sha256": "45dee1a0c7572ac0e18392798cc9c9fd755bc64562bf87872ed238de72b30892"
+  },
+  "posts/ni-tan.md": {
+    "sha256": "07881bcae9ab5549ed888af4abbf314a487d29bdc03b22a60d0a19977c30321f"
+  },
+  "posts/shu-zui.md": {
+    "sha256": "da9c4603b7e9bb03336466bbd725df2b25230d2d1e6621c8cfd616cfdc6b7ae2"
+  },
+  "posts/hai-feng-zhong-shi-luo-de-xie-se-kui-zeng.md": {
+    "sha256": "52d1221b6193600b54d1bd4676786604207662651769ed503802de5555d87edc"
+  },
+  "posts/mian-sha.md": {
+    "sha256": "0f80f12b0a3811d026e8300e49921c4a14056b5b04b8cb61b04b04afdcec1eb5"
+  }
+}