TODO: Timestamp overlay feature

Adds timestamp watermarks to frames before segment generation.

WATERMARK_ENABLED=true
WATERMARK_POSITION=top_right
WATERMARK_FONT_SIZE=24
WATERMARK_FORMAT=%Y-%m-%d %H:%M:%S.%f
WATERMARK_TIMEZONE=America/Santiago
WATERMARK_SHOW_TIMEZONE=true

• top_right
• top_left
• bottom_right
• bottom_left

• src/stream_processor/service/watermark_service.py