refactor: 通用技能按类别拆分为独立目录

skills/ → skills-dev(9), skills-req(10), skills-ops(4),
skills-integration(8), skills-biz(4), skills-workflow(7)

generate-marketplace.py 改为自动扫描所有 skills-* 目录。

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

skills-req/req-deploy-plugin/.claude-plugin/plugin.json

@@ -0,0 +1,8 @@
+{
+  "name": "req-deploy-plugin",
+  "description": "Plugin for req-deploy",
+  "version": "1.0.0",
+  "author": {
+    "name": "qiudl"
+  }
+}

skills-req/req-deploy-plugin/skill.json

@@ -0,0 +1,18 @@
+{
+  "name": "req-deploy",
+  "version": "1.0.0",
+  "description": "需求部署技能。用于 Docker 镜像构建、Staging/Production 环境部署、API 验证、前端截图验证、部署文档创建。当用户执行 /req deploy 或需要部署需求时自动激活。",
+  "triggerPatterns": [
+    "部署",
+    "deploy",
+    "staging",
+    "production",
+    "镜像构建",
+    "docker build",
+    "Jenkins",
+    "生产环境",
+    "预发布"
+  ],
+  "autoActivate": false,
+  "hidden": false
+}