docs: standardize skill-template and add development guide

assets/examples/README.md

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+# 示例 JSON
+
+- `version-response.json`：`python main.py version` 成功时 stdout 单行对象的形状参考。
+- `log-get-response.json`：若技能有日志表，`log-get` 成功时单条对象的形状参考。

assets/examples/log-get-response.json

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+{
+  "id": 1,
+  "account_id": "demo_account_1",
+  "article_id": 12,
+  "article_title": "示例标题",
+  "status": "published",
+  "error_msg": null,
+  "created_at": "2026-04-01T10:00:00",
+  "updated_at": "2026-04-01T10:00:00"
+}

assets/examples/version-response.json

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+{
+  "version": "1.0.0",
+  "skill": "your-skill-slug"
+}