feat: initial release with 48 Mattermost MCP tools

- 27 base tools: channels, messaging, users, reactions, files, DMs
- Team management: invite/remove users, get stats, list members
- Slash commands: execute /remind, /poll, etc.
- Webhook management: incoming and outgoing webhooks
- System tools: server config, logs, bulk status updates
- Channel admin: create, invite, leave, delete channels
- Read-only mode for safe exploration
- Dual token support (bot + PAT) for enhanced security
- Apache 2.0 licensed

operation/channel/slim.go

@@ -0,0 +1,45 @@
+package channel
+
+import "github.com/mattermost/mattermost-server/v6/model"
+
+func SlimChannel(c *model.Channel) map[string]interface{} {
+	if c == nil {
+		return nil
+	}
+	return map[string]interface{}{
+		"id":           c.Id,
+		"name":         c.Name,
+		"display_name": c.DisplayName,
+		"type":         string(c.Type),
+		"team_id":      c.TeamId,
+	}
+}
+
+func DetailedChannel(c *model.Channel, memberCount int64) map[string]interface{} {
+	if c == nil {
+		return nil
+	}
+	return map[string]interface{}{
+		"id":           c.Id,
+		"name":         c.Name,
+		"display_name": c.DisplayName,
+		"type":         string(c.Type),
+		"team_id":      c.TeamId,
+		"purpose":      c.Purpose,
+		"header":       c.Header,
+		"creator_id":   c.CreatorId,
+		"create_at":    c.CreateAt,
+		"member_count": memberCount,
+	}
+}
+
+func SlimChannelMember(m model.ChannelMember) map[string]interface{} {
+	return map[string]interface{}{
+		"user_id":       m.UserId,
+		"channel_id":    m.ChannelId,
+		"roles":         m.Roles,
+		"last_viewed":   m.LastViewedAt,
+		"msg_count":     m.MsgCount,
+		"mention_count": m.MentionCount,
+	}
+}