Function process_programme_for_timeshift 

pub fn process_programme_for_timeshift(
    config: &CatchupConfig,
    programme_start: i64,
    programme_end: i64,
    programme_catchup_id: Option<&str>,
    timezone_shift_secs: i32,
) -> String

Build a catchup URL for time-shifted playback of a specific EPG programme.

Translated from the logic in CatchupController::ProcessEPGTagForTimeshiftedPlayback() and CatchupController::GetCatchupUrl(). Takes programme start/end times and produces the fully-substituted URL using the channel’s catchup source template.

Arguments

• config - The channel’s resolved catchup configuration.
• programme_start - Programme start time (UTC epoch seconds).
• programme_end - Programme end time (UTC epoch seconds).
• programme_catchup_id - Optional catchup-id from the EPG entry.
• timezone_shift_secs - Combined tvg-shift + catchup correction in seconds.