feat: 全链路优化 — 死锁修复、MD3主题、上下文持久化、群聊自然化、打字状态、知识库

**死锁根因修复**
- periodicThinkLoop:1015 orphaned lock → 删除（字段已原子化）
- RecordUserMessage 隔离为 recordMu
- atomic.Int64 替换 lastUserMessage/lastThinkTime 等

**MD3 / Android 17 主题**
- 毛玻璃卡片 (backdrop-filter)
- MD3 色彩令牌 (pink primary #f472b6)
- icons.js 独立矢量图标库 + 运行时 emoji 替换
- 无边框卡片、圆角按钮、阴影层次

**上下文持久化**
- AddMessage → saveToDB 异步写 PostgreSQL
- LoadFromDB 恢复 (admin-session-main + 懒加载)
- LLMMessage.Timestamp 字段

**群聊与适配器**
- group_ambient 模式: 非@消息让 LLM 自己判断是否插话
- 戳一戳动作消息总是回复
- NapCat 打字状态 (set_input_status, 最小3秒显示)
- HTTP API 配置 (http_url/http_token)

**知识库 & 防编造**
- knowledge.CanHandle 对 chat 意图也触发
- 关键词预筛选避免无关 embedding 调用
- persona + synthesizer 三重诚实规则
- 工具结果持久化到会话历史

**平台桥接器**
- detached:true Go进程独立存活
- ethend 重启自动接管已运行服务
- stop() 接管模式 taskkill/F/ PID
- Windows netstat 替代 fuser 获取 PID
- 重复适配器种子逻辑修复
- 失败转发日志 Direction: error

**崩溃诊断**
- crashlog 包 (Recover + WrapHTTP + LLMCall)
- /api/v1/debug/goroutines 端点
- thinker 操作日志 + 30s stats
- 日志写入 logs/ 目录持久化

Co-Authored-By: Claude <noreply@anthropic.com>

backend/platform-bridge/internal/handler/bridge_handler.go

@@ -7,11 +7,21 @@ import (
 	"net/http"
 	"os"
 	"strconv"
+	"strings"
 	"sync"
+	"regexp"
 
 	"git.yeij.top/AskaEth/Cyrene/platform-bridge/internal/bridge"
 )
 
+// Regex patterns for markdown stripping.
+var (
+	mdBoldRe          = regexp.MustCompile(`\*\*(.+?)\*\*`)
+	mdItalicRe        = regexp.MustCompile(`\*(.+?)\*`)
+	mdStrikethroughRe = regexp.MustCompile(`~~(.+?)~~`)
+	mdHeadingRe       = regexp.MustCompile(`(?m)^#{1,6}\s+`)
+)
+
 // BridgeHandler exposes the Platform Bridge REST API.
 type BridgeHandler struct {
 	router         *bridge.PlatformRouter
@@ -200,39 +210,57 @@ func (h *BridgeHandler) sendProactive(w http.ResponseWriter, r *http.Request) {
 	userID := parseIntSafe(req.UserID)
 	groupID := parseIntSafe(req.GroupID)
 
+	// 过滤 <action>/<app> 标签，去除 markdown 标记
+	content := filterActions(req.Content)
+	content = convertMarkdownPlain(content)
+
+	// 按 \n\n 和 ♪ 拆分为多条消息
+	messages := splitProactiveContent(content)
+
 	// Prepend CQ @mention tag if at_user_id is specified
-	content := req.Content
+	atPrefix := ""
 	if req.AtUserID != "" {
-		content = fmt.Sprintf("[CQ:at,qq=%s] %s", req.AtUserID, content)
+		atPrefix = fmt.Sprintf("[CQ:at,qq=%s] ", req.AtUserID)
 	}
 
-	// Resolve adapter: try exact name first, then find by platform type.
+	// Resolve adapter
 	adapterName := req.Platform
-	err := h.router.SendProactive(adapterName, msgType, userID, groupID, content)
-	if err != nil {
-		for _, name := range h.router.ListAdapters() {
-			if a, aErr := h.router.GetAdapter(name); aErr == nil && a.PlatformName() == req.Platform && a.IsConnected() {
-				adapterName = name
-				err = h.router.SendProactive(name, msgType, userID, groupID, content)
-				break
+	var sendErr error
+	for i, msg := range messages {
+		fullMsg := atPrefix + msg
+		if i > 0 {
+			atPrefix = "" // only first message gets @mention
+		}
+		sendErr = h.router.SendProactive(adapterName, msgType, userID, groupID, fullMsg)
+		if sendErr != nil {
+			// Fallback: try other adapters with same platform name
+			for _, name := range h.router.ListAdapters() {
+				if a, aErr := h.router.GetAdapter(name); aErr == nil && a.PlatformName() == req.Platform && a.IsConnected() {
+					adapterName = name
+					sendErr = h.router.SendProactive(name, msgType, userID, groupID, fullMsg)
+					break
+				}
 			}
 		}
+		if sendErr != nil {
+			log.Printf("[send-proactive] 发送失败: adapter=%s err=%v", adapterName, sendErr)
+			break
+		}
+		log.Printf("[send-proactive] 已发送: adapter=%s chat=%s user=%d group=%d at=%s len=%d msg=%d/%d",
+			adapterName, msgType, userID, groupID, req.AtUserID, len(fullMsg), i+1, len(messages))
+		if h.logFn != nil {
+			chID := req.GroupID
+			if msgType == "private" {
+				chID = req.UserID
+			}
+			h.logFn(req.Platform, chID, "Cyrene", fullMsg, true)
+		}
 	}
-	if err != nil {
-		log.Printf("[send-proactive] 发送失败: adapter=%s err=%v", adapterName, err)
-		writeJSON(w, http.StatusInternalServerError, errResp("send failed: "+err.Error()))
+	if sendErr != nil {
+		writeJSON(w, http.StatusInternalServerError, errResp("send failed: "+sendErr.Error()))
 		return
 	}
 
-	log.Printf("[send-proactive] 已发送: adapter=%s chat=%s user=%d group=%d at=%s len=%d",
-		adapterName, msgType, userID, groupID, req.AtUserID, len(content))
-	if h.logFn != nil {
-		chID := req.GroupID
-		if msgType == "private" {
-			chID = req.UserID
-		}
-		h.logFn(req.Platform, chID, "Cyrene", content, true)
-	}
 	writeJSON(w, http.StatusOK, map[string]interface{}{
 		"success": true,
 		"message": "消息已发送",
@@ -259,3 +287,71 @@ func writeJSON(w http.ResponseWriter, status int, data interface{}) {
 	w.WriteHeader(status)
 	json.NewEncoder(w).Encode(data)
 }
+
+// filterActions removes <action> and <app> tags and their content.
+func filterActions(text string) string {
+	tags := [][2]string{
+		{"<action>", "</action>"},
+		{"<app>", "</app>"},
+	}
+	for _, t := range tags {
+		openTag, closeTag := t[0], t[1]
+		for {
+			start := strings.Index(text, openTag)
+			if start == -1 {
+				break
+			}
+			end := strings.Index(text[start:], closeTag)
+			if end == -1 {
+				text = text[:start] + text[start+len(openTag):]
+				continue
+			}
+			text = text[:start] + text[start+end+len(closeTag):]
+		}
+	}
+	return strings.TrimSpace(text)
+}
+
+// convertMarkdownPlain strips basic markdown formatting.
+func convertMarkdownPlain(md string) string {
+	md = mdBoldRe.ReplaceAllString(md, "$1")
+	md = mdItalicRe.ReplaceAllString(md, "$1")
+	md = mdStrikethroughRe.ReplaceAllString(md, "$1")
+	md = mdHeadingRe.ReplaceAllString(md, "")
+	return md
+}
+
+// splitProactiveContent splits long proactive content into multiple messages.
+// Strategy same as splitContent in cmd/main.go: split by \n\n, then by ♪.
+func splitProactiveContent(text string) []string {
+	rawParts := strings.Split(text, "\n\n")
+	var parts []string
+	for _, p := range rawParts {
+		p = strings.TrimSpace(p)
+		if p == "" {
+			continue
+		}
+		if strings.Contains(p, "♪") {
+			for _, sub := range strings.Split(p, "♪") {
+				sub = strings.TrimSpace(sub)
+				if sub != "" {
+					parts = append(parts, sub)
+				}
+			}
+		} else {
+			parts = append(parts, p)
+		}
+	}
+
+	// Merge very short segments with neighbors (min 8 runes).
+	const minRunes = 8
+	var merged []string
+	for _, part := range parts {
+		if len([]rune(part)) < minRunes && len(merged) > 0 {
+			merged[len(merged)-1] = merged[len(merged)-1] + part
+		} else {
+			merged = append(merged, part)
+		}
+	}
+	return merged
+}