chore(marketplace): add publish-plugin, rewrite init.sh, cleanup obsolete plugins

- Add publish-plugin: marketplace publish + Feishu bot notification
- Rewrite init.sh: SSE-first, fixed prod API, remove env selection
- Update CLAUDE.md, README.md, claude-config.yaml
- Update skills: req-plugin, req-prd-plugin, pull-request-plugin
- Delete sync-skills.sh (obsolete)
- Delete deprecated plugins: skills-ops/*, skills-projects/*, old skills-dev/req duplicates
- Regenerate marketplace.json (27 plugins)

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

skills-core/publish-plugin/.claude-plugin/plugin.json

@@ -0,0 +1,8 @@
+{
+  "name": "publish-plugin",
+  "description": "发布 ai-proj-helper 技能市场更新并通知飞书群。当用户提到发布、publish、更新技能市场时自动激活。",
+  "version": "1.0.0",
+  "author": {
+    "name": "qiudl"
+  }
+}