docs: add OmO workflow to README and fix plugin marketplace structure

- Add OmO multi-agent orchestrator documentation to README.md and README_CN.md
- Fix marketplace.json to follow official Claude Code plugin schema
- Add $schema field and move version/description to top level
- Create proper .claude-plugin/plugin.json for all plugins
- Remove non-standard marketplace.json from plugin subdirectories
- Simplify plugin names: omo, dev, requirements, bmad, essentials

Generated with SWE-Agent.ai

Co-Authored-By: SWE-Agent.ai <noreply@swe-agent.ai>

requirements-driven-workflow/.claude-plugin/marketplace.json

@@ -1,33 +0,0 @@
-{
-  "name": "requirements-driven-development",
-  "source": "./",
-  "description": "Streamlined requirements-driven development workflow with 90% quality gates for practical feature implementation",
-  "version": "1.0.0",
-  "author": {
-    "name": "Claude Code Dev Workflows",
-    "url": "https://github.com/cexll/myclaude"
-  },
-  "homepage": "https://github.com/cexll/myclaude",
-  "repository": "https://github.com/cexll/myclaude",
-  "license": "MIT",
-  "keywords": [
-    "requirements",
-    "workflow",
-    "automation",
-    "quality-gates",
-    "feature-development",
-    "agile",
-    "specifications"
-  ],
-  "category": "workflows",
-  "strict": false,
-  "commands": [
-    "./commands/requirements-pilot.md"
-  ],
-  "agents": [
-    "./agents/requirements-generate.md",
-    "./agents/requirements-code.md",
-    "./agents/requirements-testing.md",
-    "./agents/requirements-review.md"
-  ]
-}

requirements-driven-workflow/.claude-plugin/plugin.json

@@ -0,0 +1,9 @@
+{
+  "name": "requirements",
+  "description": "Requirements-driven development workflow with quality gates for practical feature implementation",
+  "version": "5.6.1",
+  "author": {
+    "name": "cexll",
+    "email": "cexll@cexll.com"
+  }
+}