fix: propagate TenantID in channel InboundMessage for tenant-scoped MCP resolution (#561)

All channel handlers (Telegram, Discord, Slack, Feishu) bypassed
BaseChannel.HandleMessage() and manually constructed InboundMessage
without setting TenantID. This caused the consumer to fall back to
MasterTenantID, making DB-level MCP server grants invisible on
non-master tenants while config-file MCP servers worked fine.

Closes #560

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

internal/channels/discord/handler.go

@@ -300,6 +300,7 @@ func (c *Channel) handleMessage(_ *discordgo.Session, m *discordgo.MessageCreate
 		PeerKind: peerKind,
 		UserID:   senderID,
 		AgentID:  targetAgentID,
+		TenantID: c.TenantID(),
 		Metadata: metadata,
 	})
 

internal/channels/feishu/bot.go

@@ -291,6 +291,7 @@ func (c *Channel) handleMessageEvent(ctx context.Context, event *MessageEvent) {
 		UserID:       userID,
 		AgentID:      targetAgentID,
 		HistoryLimit: c.historyLimit,
+		TenantID:     c.TenantID(),
 		Metadata:     metadata,
 	})
 

internal/channels/slack/utils.go

@@ -45,6 +45,7 @@ func (c *Channel) HandleMessage(senderID, chatID, content string, mediaPaths []s
 		Media:    mediaFiles,
 		PeerKind: peerKind,
 		UserID:   userID,
+		TenantID: c.TenantID(),
 		Metadata: metadata,
 		AgentID:  c.AgentID(),
 	})

internal/channels/telegram/commands.go

@@ -129,6 +129,7 @@ func (c *Channel) handleBotCommand(ctx context.Context, message *telego.Message,
 			PeerKind: peerKind,
 			AgentID:  c.AgentID(),
 			UserID:   strings.SplitN(senderID, "|", 2)[0],
+			TenantID: c.TenantID(),
 			Metadata: map[string]string{
 				"command":           "reset",
 				"local_key":         localKey,
@@ -154,6 +155,7 @@ func (c *Channel) handleBotCommand(ctx context.Context, message *telego.Message,
 			PeerKind: peerKind,
 			AgentID:  c.AgentID(),
 			UserID:   strings.SplitN(senderID, "|", 2)[0],
+			TenantID: c.TenantID(),
 			Metadata: map[string]string{
 				"command":           "stop",
 				"local_key":         localKey,
@@ -177,6 +179,7 @@ func (c *Channel) handleBotCommand(ctx context.Context, message *telego.Message,
 			PeerKind: peerKind,
 			AgentID:  c.AgentID(),
 			UserID:   strings.SplitN(senderID, "|", 2)[0],
+			TenantID: c.TenantID(),
 			Metadata: map[string]string{
 				"command":           "stopall",
 				"local_key":         localKey,

internal/channels/telegram/handlers.go

@@ -603,6 +603,7 @@ func (c *Channel) handleMessage(ctx context.Context, update telego.Update) {
 		AgentID:      targetAgentID,
 		HistoryLimit: c.historyLimit,
 		ToolAllow:    topicCfg.tools,
+		TenantID:     c.TenantID(),
 		Metadata:     metadata,
 	})
 
@@ -611,4 +612,3 @@ func (c *Channel) handleMessage(ctx context.Context, update telego.Update) {
 		c.groupHistory.Clear(localKey)
 	}
 }
-