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/user/slim.go

@@ -0,0 +1,17 @@
+package user
+
+import "github.com/mattermost/mattermost-server/v6/model"
+
+func SlimUser(u *model.User) map[string]interface{} {
+	if u == nil {
+		return nil
+	}
+	return map[string]interface{}{
+		"id":         u.Id,
+		"username":   u.Username,
+		"email":      u.Email,
+		"first_name": u.FirstName,
+		"last_name":  u.LastName,
+		"roles":      u.Roles,
+	}
+}