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

pkg/flag/flag.go

@@ -0,0 +1,14 @@
+package flag
+
+var (
+	Version     = "dev"
+	ReadOnly    = false
+	Debug       = false
+	ShowVersion = false
+	Insecure    = false
+	Token       = ""
+	BotToken    = ""
+	PAT         = ""
+	Host        = ""
+	Team        = ""
+)