Support Microsoft Teams shorter meeting URLs (teams.microsoft.com/meet/...)

[Copilot]

Teams has rolled out shorter meeting URLs (https://teams.microsoft.com/meet/<meetingId>?p=<passcode>) as the new default for Meet Now and scheduled meetings. The existing ParseJoinURL logic only handled the legacy long-form URLs with embedded JSON context, causing these new URLs to fail with a parse error.

Changes

URL Parsing (JoinInfo.cs — all variants)

Added short URL detection ahead of the existing long-URL regex. For short URLs, the meetingId and optional passcode are extracted from the path/query string. chatInfo is returned as null since thread/message IDs don't exist in this format.

• Sample.Common.V1 / Sample.Common.Beta / EchoBot: Use JoinMeetingIdMeetingInfo natively (available in Microsoft.Graph ≥ 4.54.0 and Microsoft.Graph.Beta)
• Sample.Common (Microsoft.Graph 4.7.0): Uses TokenMeetingInfo with overridden ODataType = "#microsoft.graph.joinMeetingIdMeetingInfo" and AdditionalData to produce the correct wire format, since the type was added in a later 4.x release
• PsiBot (Microsoft.Graph 4.54.0): Uses JoinMeetingIdMeetingInfo directly in the inline ParseJoinURL method

// Short URL: https://teams.microsoft.com/meet/123456789?p=abc123
var meetingInfo = new JoinMeetingIdMeetingInfo
{
    JoinMeetingId = "123456789",
    Passcode = "abc123",
};
return (null, meetingInfo);  // chatInfo is null — no thread context in short URLs

Caller fixes (BotService.cs)

• EchoBot: Fixed hard cast (meetingInfo as OrganizerMeetingInfo).Organizer...GetTenantId() → null-safe ?. chain; updated duplicate-call guard to handle null chatInfo
• PsiBot: Same null-safe fix for tenantId extraction

Original prompt

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This section details on the original issue you should resolve

<issue_title>Support Microsoft Teams Shorter meeting URLs</issue_title>
<issue_description>Please update the real time media sample to support joining Teams meetings using the shorter URL in the form of https://teams.microsoft.com/meet/meeting_id?p=HashedPasscode, as announced here and here. The new format is now the default for "Meet Now" and is being rolled out to meetings scheduled in calendar.

Note: Get onlineMeeting API can fetch the long URL format by the short version. But it requires delegated permission of the meeting owner, which we don't know from the shorter URL.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Support Microsoft Teams Shorter meeting URLs #847

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