feat(channels): add feishu channel support with build tags

Introduced a stub implementation for the Feishu channel to allow compilation without the feishu tag, preventing dependency issues. Updated the NewFeishuChannel function signature to return a generic Channel type, accommodating both the stub and the actual implementation. This change resolves potential MaxInt64 overflow problems in specific environments.

pkg/channels/feishu.go

@@ -1,3 +1,7 @@
+// 飞书通道实现。通过 build tag 可选编译，规避 larksuite/oapi-sdk-go 的 math.MaxInt64 溢出问题。
+// 旧实现：无 build tag，始终编译，导致依赖的 larksuite drive/v1 在部分环境编译失败。
+//go:build feishu
+
 package channels
 
 import (
@@ -28,7 +32,10 @@ type FeishuChannel struct {
 	cancel context.CancelFunc
 }
 
-func NewFeishuChannel(cfg config.FeishuConfig, bus *bus.MessageBus) (*FeishuChannel, error) {
+// NewFeishuChannel 创建飞书通道。
+// 旧签名: func NewFeishuChannel(cfg config.FeishuConfig, bus *bus.MessageBus) (*FeishuChannel, error)
+// 改为 (Channel, error) 以便 feishu_stub.go 在未编译飞书时返回 nil 占位。
+func NewFeishuChannel(cfg config.FeishuConfig, bus *bus.MessageBus) (Channel, error) {
 	base := NewBaseChannel("feishu", cfg, bus, cfg.AllowFrom)
 
 	return &FeishuChannel{

pkg/channels/feishu_stub.go

@@ -0,0 +1,16 @@
+// 未启用飞书时的占位实现，使 manager 在无 -tags=feishu 时仍可编译。
+// 旧方案：无此文件，feishu.go 始终参与编译，强制依赖 larksuite 导致 MaxInt64 溢出。
+//go:build !feishu
+
+package channels
+
+import (
+	"fmt"
+
+	"github.com/sipeed/picoclaw/pkg/bus"
+	"github.com/sipeed/picoclaw/pkg/config"
+)
+
+func NewFeishuChannel(cfg config.FeishuConfig, bus *bus.MessageBus) (Channel, error) {
+	return nil, fmt.Errorf("feishu support not compiled in, build with -tags=feishu")
+}

pkg/channels/manager.go

@@ -73,13 +73,15 @@ func (m *Manager) initChannels() error {
 
 	if m.config.Channels.Feishu.Enabled {
 		logger.DebugC("channels", "Attempting to initialize Feishu channel")
-		feishu, err := NewFeishuChannel(m.config.Channels.Feishu, m.bus)
+		// 旧: feishu, err := NewFeishuChannel(...); m.channels["feishu"] = feishu
+		// 改用 ch 以适配 NewFeishuChannel 返回 (Channel, error) 的接口
+		ch, err := NewFeishuChannel(m.config.Channels.Feishu, m.bus)
 		if err != nil {
 			logger.ErrorCF("channels", "Failed to initialize Feishu channel", map[string]interface{}{
 				"error": err.Error(),
 			})
 		} else {
-			m.channels["feishu"] = feishu
+			m.channels["feishu"] = ch
 			logger.InfoC("channels", "Feishu channel enabled successfully")
 		}
 	}