sdk: embed non-toolchain SDK in third_party, add NoMemory/Cleaner support

- Embed sdk/, example/, meta/, go.mod from homeagent-sdk (no .git)
- Core .gitignore excludes SDK toolchain: bin/, tools/, package/
- RegisterInputChannel + ChannelDef(NoMemory, Cleaner) in SDK
- IOManager input channel registry with GetInputChannelDef
- eventloop: apply channel Cleaner/NoMemory to interrupt text
- context engine: channelDefLookup applied in textForVector
- document store: ChannelCleaner param for archive functions
- All callers/adapters updated with ChannelDef{} default

internal/plugins/webui/plugin.go

@@ -157,7 +157,7 @@ func (p *Plugin) Name() string { return p.name }
 func (p *Plugin) Start(s *sdk.PluginSDK) error {
 	s.SetAutoRestart(true)
 
-	s.RegisterOutputChannel("webui", 1, "Web 控制台", func(args map[string]interface{}) (interface{}, error) {
+	s.RegisterOutputChannel("webui", 1, "Web 控制台", sdk.ChannelDef{}, func(args map[string]interface{}) (interface{}, error) {
 		payload, _ := args["payload"].(string)
 		if payload != "" {
 			p.evBus.Publish(&events.Event{