feat: multi-language embedding with CleanTemplateText + three-branch vector strategy

- StaticEmbedder: pre-trained ConceptNet Numberbatch/fastText word embeddings,
  auto-download with TF-IDF fallback, comma-separated multi-model paths
- CleanTemplateText: regex stripping of QQ tool call templates and noise
- textForVector: per-source vector strategy (agent→Response, user→Input,
  cold_storage→both)
- Indexer.BuildContext and ExtractKeywords now clean input before vectorization
- Protect recent 10 events in Prune (regression fix: use local var not const)

internal/memory/clean_text.go

@@ -0,0 +1,57 @@
+package memory
+
+import (
+	"regexp"
+	"strings"
+
+	"gitcode.com/JianFeeeee/HomeAgent/internal/memory/vector"
+)
+
+var (
+	reQQGroupSuffix = regexp.MustCompile(
+		`，通过id\d+使用qq_get_message工具获取消息正文。获取内容后使用 output_send\(channel="qq"\) 回复该群聊，content 设为 JSON 字符串：\{[^}]*\}`,
+	)
+	reQQPrivateSuffix = regexp.MustCompile(
+		`，通过id\d+使用qq_get_message工具获取消息正文。获取内容后使用 output_send\(channel="qq"\) 回复对方，content 设为 JSON 字符串：\{[^}]*\}`,
+	)
+	reQQOldReply = regexp.MustCompile(
+		`通过id\d+使用qq_get_message工具获取消息正文。获取后必须使用[^。]+。`,
+	)
+	reQQOldForbid = regexp.MustCompile(
+		`你只能通过qq_get_message先看消息，然后直接用%!s\(MISSING\)send_private_msg回复，中间的思考过程禁止调用任何其他工具\s*→\s*`,
+	)
+	reQQGeneral = regexp.MustCompile(
+		`通过id\d+使用qq_get_message工具获取消息正文[。，][^。]*?(?:回复|发送消息)`,
+	)
+	reTimestamp = regexp.MustCompile(
+		`\[\d{2}:\d{2}\]\s*`,
+	)
+	reAgentPrefix = regexp.MustCompile(
+		`冷知识|注意|提示|核心要求|规则`,
+	)
+	reMultiSpace = regexp.MustCompile(`\s+`)
+)
+
+func CleanTemplateText(text string) string {
+	text = reQQGroupSuffix.ReplaceAllString(text, "")
+	text = reQQPrivateSuffix.ReplaceAllString(text, "")
+	text = reQQOldReply.ReplaceAllString(text, "")
+	text = reQQOldForbid.ReplaceAllString(text, "")
+	text = reQQGeneral.ReplaceAllString(text, "")
+	text = reTimestamp.ReplaceAllString(text, "")
+	text = reMultiSpace.ReplaceAllString(text, " ")
+	text = strings.TrimSpace(text)
+
+	if text == "" {
+		return ""
+	}
+
+	text = strings.TrimPrefix(text, "，")
+	text = strings.TrimPrefix(text, "，")
+	text = strings.TrimSpace(text)
+	return text
+}
+
+func (e *StaticEmbedder) VectorizeClean(text string) vector.Vector {
+	return e.Vectorize(CleanTemplateText(text))
+}