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>

development-essentials/.claude-plugin/marketplace.json

@@ -1,44 +0,0 @@
-{
-  "name": "development-essentials",
-  "source": "./",
-  "description": "Essential development commands for coding, debugging, testing, optimization, and documentation",
-  "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": [
-    "code",
-    "debug",
-    "test",
-    "optimize",
-    "review",
-    "bugfix",
-    "refactor",
-    "documentation"
-  ],
-  "category": "essentials",
-  "strict": false,
-  "commands": [
-    "./commands/code.md",
-    "./commands/debug.md",
-    "./commands/test.md",
-    "./commands/optimize.md",
-    "./commands/review.md",
-    "./commands/bugfix.md",
-    "./commands/refactor.md",
-    "./commands/docs.md",
-    "./commands/ask.md",
-    "./commands/think.md"
-  ],
-  "agents": [
-    "./agents/code.md",
-    "./agents/bugfix.md",
-    "./agents/bugfix-verify.md",
-    "./agents/optimize.md",
-    "./agents/debug.md"
-  ]
-}

development-essentials/.claude-plugin/plugin.json

@@ -0,0 +1,9 @@
+{
+  "name": "essentials",
+  "description": "Essential development commands for coding, debugging, testing, optimization, and documentation",
+  "version": "5.6.1",
+  "author": {
+    "name": "cexll",
+    "email": "cexll@cexll.com"
+  }
+}