refactor: rename openclaw -> clawhubadapter, add ClawHub search/install, fix agent interrupt

- Rename internal/plugins/openclaw/ -> internal/plugins/clawhubadapter/
- Add RegistryDispatcher with 5 sub-registries (Tool, Provider, Channel, Stage, Cap)
- Add clawhubadapter_search tool for ClawHub marketplace search
- Add clawhub: prefix support for installing from ClawHub (ZIP/tgz auto-detect)
- Add CallProvider RPC and provider/call routing
- Fix QQ interrupt: check interceptCh before/after each tool execution

internal/plugins/clawhubadapter/testdata/oc-simple/index.js

@@ -0,0 +1,31 @@
+module.exports = {
+  default: {
+    id: 'oc-simple',
+    name: 'OC Simple',
+    version: '1.0.0',
+    description: 'Simple test plugin for OpenClaw simulator',
+    register(api) {
+      api.registerTool({
+        name: 'greet',
+        description: 'Greet someone',
+        parameters: {
+          type: 'object',
+          properties: {
+            name: { type: 'string', description: 'Name to greet' },
+          },
+          required: ['name'],
+        },
+        execute(id, params) {
+          return `Hello, ${params.name}!`;
+        },
+      });
+      api.registerTool({
+        name: 'ping',
+        description: 'Health check ping',
+        execute(id, params) {
+          return 'pong';
+        },
+      });
+    },
+  },
+};

internal/plugins/clawhubadapter/testdata/oc-simple/openclaw.plugin.json

@@ -0,0 +1,6 @@
+{
+  "name": "oc-simple",
+  "version": "1.0.0",
+  "entry": "index.js",
+  "description": "Simple OpenClaw test plugin"
+}