Member Junction
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    JoinUrlPlatform:
        | "Zoom"
        | "Microsoft Teams"
        | "Google Meet"
        | "Cisco Webex"
        | "Slack"
        | "Discord"
        | "RingCentral"
        | "GoTo Meeting"
        | "BlueJeans"

    The canonical platform a meeting/call join URL belongs to. This is the platform identity a join URL resolves to — distinct from (but used to find) an MJAIBridgeProviderEntity row. Kept as a union type (repo convention — union over enum) so it exports cleanly and a new platform is a one-line addition.