Feature: Add Live Stream Support to Backend

[omeryusufyagci]

As needed by (#3) and (#11), live stream support needs to be integrated into the backend, extending the current static media processing to include handling of live feeds.

Objectives:

• Add a LiveStreamProcessor class that will manage the integration and communication with the MediaProcessor for realtime ingestion, buffering, and processing of live streams.
• Add a new backend endpoint (e.g., /live) that can accept live stream URLs and initiate media extraction and processing through the MediaProcessor.
• Update the existing backend logic to handle both static video and live stream processing.
• Validate if the backend can efficiently bridge the live stream data to the MediaProcessor with minimal latency and serves the processed stream back to the frontend in near-realtime. If there is a hard limitation here, a rewrite in C++ may be necessary.

Needs (#9)