fix(skills): add latestVersion and i18n to karpathy-guidelines / last30days pointer entries (#47)

## Summary / 摘要

Complete the two pointer entries added in #46 with `latestVersion` and
`i18n` blocks.

补全 #46 新增的两个 pointer 条目的 `latestVersion` 与 `i18n` 字段。

## Why / 原因

- **latestVersion**: `karpathy-guidelines` upstream `SKILL.md` has no
root-level `version`, so the client records `0.0.0` on install and the
update check (`0.0.0 == 0.0.0`)永远判定已最新——updates would be silently
skipped forever. Registering `latestVersion` here enables the
client-side fallback (shipping separately in the desirecore repo).
`karpathy-guidelines` 上游无根级 version，客户端装出来是 0.0.0 且更新判定永远跳过；在市场登记
latestVersion 配合客户端 fallback 修复。
- **i18n**: per ADR-038, market list localization must work offline from
`entry.json` alone. Both entries previously lacked `i18n`, so the list
shortDesc would render empty.
  按 ADR-038 列表本地化需离线可用，此前两条目缺 i18n，列表简介为空。

## Changes / 变更

- `skills/karpathy-guidelines/entry.json`: `latestVersion: 1.0.0` +
zh-CN/en-US `i18n`
- `skills/last30days/entry.json`: `latestVersion: 3.11.1`（与上游一致）+
zh-CN/en-US `i18n`

## Testing / 测试

- Both files validated against `marketSkillEntrySchema` (Ajv, desirecore
repo) — VALID.

- [x] I have read and agree to the CLA

skills/karpathy-guidelines/entry.json

@@ -8,6 +8,17 @@
     "coding",
     "karpathy"
   ],
+  "latestVersion": "1.0.0",
+  "i18n": {
+    "zh-CN": {
+      "name": "Karpathy 编码准则",
+      "shortDesc": "降低 LLM 常见编码错误的行为准则，源自 Andrej Karpathy 对 LLM 编码陷阱的观察"
+    },
+    "en-US": {
+      "name": "Karpathy Guidelines",
+      "shortDesc": "Behavioral guidelines to reduce common LLM coding mistakes, derived from Andrej Karpathy's observations"
+    }
+  },
   "maintainer": {
     "name": "forrestchang",
     "verified": false,

skills/last30days/entry.json

@@ -10,6 +10,17 @@
     "hacker-news",
     "web"
   ],
+  "latestVersion": "3.11.1",
+  "i18n": {
+    "zh-CN": {
+      "name": "近 30 天研究",
+      "shortDesc": "调研任意话题近 30 天的真实讨论，聚合 Reddit、X、YouTube、HN、Polymarket、GitHub 等来源的热帖与观点"
+    },
+    "en-US": {
+      "name": "Last 30 Days",
+      "shortDesc": "Research what people actually say about any topic in the last 30 days across Reddit, X, YouTube, HN and more"
+    }
+  },
   "maintainer": {
     "name": "Matt Van Horn",
     "verified": false,