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-req/req-review-plugin/.claude-plugin/plugin.json

@@ -1,8 +0,0 @@
-{
-  "name": "req-review-plugin",
-  "description": "PRD 评审方法论。用于需求评审、PRD 文档审查、评审意见编写。当执行 /req review 或需要评审 PRD 文档时使用。",
-  "version": "1.0.0",
-  "author": {
-    "name": "qiudl"
-  }
-}