feat(chat): 动作/旁白格式统一——兼容星号(＊…＊/＊…) + 人设强制 XML

模型常漂移成 ＊动作：弯起眼睛＊(星号)，前端/后端只认 <action>/<narration>，导致星号版
没被剥成灰斜体注记/没从 IM 剥除→裸出在气泡、上下文不连贯。
- parseContent.ts(新): 把 XML <action>/<narration>、全角＊…＊(带'动作/旁白/内心/神态/轻声'
  关键词或整段≤40字)、半角*词…*(仅关键词前缀)统一解析成 ContentPart,剥出正文进 BubbleNotes
  灰斜体注记(＊动作:…＊); 超长无关键词＊…＊保留为文本; <p>拆气泡不变
- sanitize.go: stripNarration 同样剥星号动作(与 XML 一致); splitBubbles 不变
- cyrene.yaml: 新增格式铁律——动作/旁白必须用 <action>/<narration>,禁用＊/Markdown等
验收: 后端 build/vet/test 全绿 + 前端 build 绿 + Node parseContent/splitBubble 实测(5组)

internal/services/channelbridge/sanitize_test.go

@@ -89,3 +89,72 @@ func TestSplitBubbles_OnlyActionIsEmpty(t *testing.T) {
 		t.Errorf("splitBubbles = %#v, want empty", got)
 	}
 }
+
+func TestStripNarration_StripsFullStarRoleplay(t *testing.T) {
+	t.Parallel()
+	in := "＊动作：弯起眼睛笑了＊\n当然看得到呀，亲爱的。"
+	got := stripNarration(in)
+	want := "当然看得到呀，亲爱的。"
+	if got != want {
+		t.Errorf("stripNarration = %q, want %q", got, want)
+	}
+}
+
+func TestStripNarration_StripsKeywordHalfStarRoleplay(t *testing.T) {
+	t.Parallel()
+	in := "*旁白：心里有点甜*\n这是正文。"
+	got := stripNarration(in)
+	want := "这是正文。"
+	if got != want {
+		t.Errorf("stripNarration = %q, want %q", got, want)
+	}
+}
+
+func TestStripNarration_KeepsPlainEmphasis(t *testing.T) {
+	t.Parallel()
+	in := "这是一段 *强调* 文字，不是动作。"
+	if got := stripNarration(in); got != in {
+		t.Errorf("stripNarration stripped emphasis: %q -> %q", in, got)
+	}
+}
+
+func TestStripNarration_MixedStarAndXml(t *testing.T) {
+	t.Parallel()
+	in := "<action>拍拍肩膀</action> ＊旁白：其实有点开心＊ 你来了呀。对了 *强调*。"
+	got := stripNarration(in)
+	for _, leaked := range []string{"action", "旁白", "拍拍", "其实有点开心"} {
+		if strings.Contains(got, leaked) {
+			t.Errorf("stripNarration left role-play %q: %q", leaked, got)
+		}
+	}
+	if !strings.Contains(got, "你来了呀") || !strings.Contains(got, "*强调*") {
+		t.Errorf("stripNarration dropped chat/emphasis: %q", got)
+	}
+}
+
+func TestStripNarration_OnlyStarActionBecomesEmpty(t *testing.T) {
+	t.Parallel()
+	if got := stripNarration("＊弯起眼睛＊"); got != "" {
+		t.Errorf("stripNarration = %q, want empty", got)
+	}
+}
+
+func TestStripNarration_KeepsLongKeywordlessFullStar(t *testing.T) {
+	t.Parallel()
+	in := "＊这是一段很长的全角星号包裹的普通段落，足足有几十个字，超过阈值所以应当被保留而不是被剥掉。＊"
+	if got := stripNarration(in); got != in {
+		t.Errorf("stripNarration dropped long full-width star text: %q -> %q", in, got)
+	}
+}
+
+func TestSplitBubbles_StripsStarRoleplayInParagraphs(t *testing.T) {
+	t.Parallel()
+	in := "<p>＊动作：弯起眼睛＊当然看得到呀。</p><p>*旁白：心里甜* 好。</p>"
+	got := splitBubbles(in)
+	if len(got) != 2 || got[0] != "当然看得到呀。" {
+		t.Errorf("splitBubbles = %#v", got)
+	}
+	if got[1] != "好。" {
+		t.Errorf("splitBubbles[1] = %q, want 好。", got[1])
+	}
+}