fix(webui): capture all-channel chat history and correct input source

- handleChat now injects with source=webui so the LLM no longer sees
  cli as the input channel
- subscribe to EventRawInput/EventAgentOutput to persist every
  conversation turn from all channels (cli/qq/webui), replacing the
  manual webui-only addChatMsg to avoid duplicates
- ChatMsg gains a source field; GUI shows a channel badge for
  non-webui messages

cmd/gui/renderer/app.js

@@ -371,6 +371,9 @@ function renderChat() {
         });
       }
       var body = rc + tcs + '<div class="text">' + c + '</div>';
+      if (m.source && m.source !== 'webui') {
+        body = '<div class="msg-source">' + escHtml(__('通道','Channel')) + ': ' + escHtml(m.source) + '</div>' + body;
+      }
       if (role === 'system') {
         html += '<div class="msg msg-system"><div class="msg-bubble">' + body + '</div></div>';
       } else {

cmd/gui/renderer/style.css

@@ -176,6 +176,7 @@ code { font-family:monospace; font-size:12px; color:var(--pre-color) }
 .msg-system .msg-avatar { background:var(--msg-system-bg); color:var(--msg-system-color) }
 .msg-content { min-width:0 }
 .msg-bubble { padding:8px 12px; border-radius:10px; font-size:13px; line-height:1.5; word-break:break-word; position:relative }
+.msg-source { font-size:11px; opacity:.55; margin-bottom:4px; color:inherit }
 .msg-user .msg-bubble { background:var(--msg-user-bg); color:var(--msg-user-color); border-bottom-right-radius:4px }
 .msg-assistant .msg-bubble { background:var(--msg-assistant-bg); color:var(--msg-assistant-color); border-bottom-left-radius:4px }
 .msg-system .msg-bubble { background:var(--msg-system-bg); color:var(--msg-system-color); text-align:center; font-size:12px }

internal/plugins/webui/handler.go

@@ -65,6 +65,7 @@ type ChatMsg struct {
 	Role             string `json:"role"`
 	Content          string `json:"content"`
 	ReasoningContent string `json:"reasoning_content,omitempty"`
+	Source           string `json:"source,omitempty"`
 	Time             string `json:"time"`
 }
 
@@ -136,6 +137,7 @@ func NewHandler(s *sdk.PluginSDK) *Handler {
 	h.loadChatHistory()
 	if s != nil {
 		go h.trackToolEvents()
+		h.subscribeChatEvents()
 	}
 	return h
 }
@@ -170,6 +172,40 @@ func (h *Handler) trackToolEvents() {
 	})
 }
 
+// subscribeChatEvents 捕获所有通道（cli/qq/webui 等）的对话轮次，
+// 与 handleChat 的注入一起构成完整的全通道对话历史。
+func (h *Handler) subscribeChatEvents() {
+	if h.sdk == nil {
+		return
+	}
+	h.sdk.Subscribe(sdk.EventRawInput, func(ev *sdk.Event) {
+		content, _ := ev.Payload["content"].(string)
+		source, _ := ev.Payload["source"].(string)
+		if content == "" {
+			return
+		}
+		h.addChatMsg(ChatMsg{
+			Role:    "user",
+			Content: content,
+			Source:  source,
+			Time:    time.Unix(ev.Timestamp, 0).Format(time.RFC3339),
+		})
+	})
+	h.sdk.Subscribe(sdk.EventAgentOutput, func(ev *sdk.Event) {
+		content, _ := ev.Payload["content"].(string)
+		channel, _ := ev.Payload["channel"].(string)
+		if content == "" {
+			return
+		}
+		h.addChatMsg(ChatMsg{
+			Role:    "assistant",
+			Content: content,
+			Source:  channel,
+			Time:    time.Unix(ev.Timestamp, 0).Format(time.RFC3339),
+		})
+	})
+}
+
 func (h *Handler) handleToolEvent(ev *sdk.Event) {
 	payload := ev.Payload
 	tool, _ := payload["tool"].(string)
@@ -942,12 +978,11 @@ func (h *Handler) handleChat(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	h.addChatMsg(ChatMsg{Role: "user", Content: body.Message, Time: time.Now().Format(time.RFC3339)})
 	if h.sdk == nil {
 		writeJSON(w, http.StatusServiceUnavailable, map[string]string{"error": "agent unavailable"})
 		return
 	}
-	resp := h.sdk.InjectTextSync("cli", "cli", body.Message)
+	resp := h.sdk.InjectTextSync("webui", "webui", body.Message)
 	if resp == nil {
 		writeJSON(w, http.StatusServiceUnavailable, map[string]string{"error": "agent unavailable"})
 		return
@@ -960,7 +995,6 @@ func (h *Handler) handleChat(w http.ResponseWriter, r *http.Request) {
 	if reasoning != "" {
 		result["reasoning_content"] = reasoning
 	}
-	h.addChatMsg(ChatMsg{Role: "assistant", Content: content, ReasoningContent: reasoning, Time: time.Now().Format(time.RFC3339)})
 	writeJSON(w, http.StatusOK, result)
 }