feat: output channel redesign - per-channel output gates, LLM chain events, SDKConfig

- Output channels generate per-channel tools: output_send__{name} (type=output) + output_send__{name}_help
- content is JSON string transparently passed to plugin handler for routing
- EventAgentLLMChain: full LLM response forwarded after each turn for webui/logs
- sdk.New refactored to SDKConfig struct (no more 13 positional args)
- RegisterOutputChannel adds desc param for JSON format documentation
- channelDevice simplified (no Tools method), desc field added
- Child agent permission updated for output_send__ prefix
- System prompt: output gates, multi-call, long messages split
- WebUI: subscribes to EventAgentLLMChain in SSE, no output channel
- Tests updated for new naming convention

internal/memory/document/document_test.go

@@ -4,6 +4,8 @@ import (
 	"os"
 	"testing"
 	"time"
+
+	"gitcode.com/JianFeeeee/HomeAgent/internal/memory"
 )
 
 func TestInsertAndQuery(t *testing.T) {
@@ -186,7 +188,7 @@ func TestSummarizeEntries(t *testing.T) {
 }
 
 func TestExtractKeywords(t *testing.T) {
-	kws := extractKeywords("今天天气很好")
+	kws := memory.ExtractKeywords("今天天气很好")
 	if len(kws) == 0 {
 		t.Error("should extract keywords from Chinese text")
 	}