feat: 单插件重载等 PluginMgr 能力导出到外部 SDK

- meta: CORE_PLUGIN_RELOAD_ONE(48) / LIST_LOADED(49) / IS_DISABLED(50)
- sdk: PluginMgrAPI 接口(ReloadOne/ListLoadedPlugins/IsPluginDisabled) +
  PluginSDK.SetPluginMgrAPI/PluginMgr() 访问器
- plugindev 模板: dispatchPluginMgr 桥接注入,走 C ABI 48/49/50

tools/plugindev/main.go

@@ -30,15 +30,20 @@ func help() {
 	fmt.Print(`HomeAgent Plugin Dev Tool
 
 Usage:
-  plugindev init <name>           Scaffold a new plugin project
-  plugindev build [flags]         Compile and package plugin
-  plugindev clean                 Clean build/dist artifacts
-  plugindev debug [dir]           Interpret and debug plugin source
-  plugindev sdk <command>         Manage SDK versions
+  plugindev init <name>             Scaffold a new plugin project
+  plugindev init <name> --lua       Create Lua plugin
+  plugindev init <name> --type remotedevice
+                                    Create C remote device adapter
+  plugindev build [flags]           Compile and package plugin
+  plugindev clean                   Clean build/dist artifacts
+  plugindev debug [dir]             Interpret and debug plugin source
+  plugindev sdk <command>           Manage SDK versions
 
 Flags:
   --outdir    Output directory (default: dist)
   --target    Target OS/arch (e.g. linux/amd64), repeatable
   --lua       Create Lua plugin (for init)
+  --type      Project type: "remotedevice" (for init)
+  -t          Alias for --type
 `)
 }