Initial implementation of video_probe (Rust)

Core modules:
- probe.rs: ffprobe execution logic
- parser.rs: JSON parsing logic
- output.rs: Output formatting
- lib.rs: Library interface
- main.rs: CLI entry point

Features:
- Extract video metadata using ffprobe
- Parse video/audio/subtitle streams
- Save to JSON file
- Console summary output

Documentation:
- Added QUICKSTART.md
- Added ENVIRONMENT_SETUP_REPORT.md

ISSUE_time_overlay.md

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+# Issue: Add video time code and total time display overlay
+
+## Description
+Display video time code and total duration on the video playback window, but ensure it doesn't cover/obscure the video content itself.
+
+## Requirements
+1. Show current time code (e.g., `00:01:23`)
+2. Show total duration (e.g., `00:05:30`)
+3. Display format: `current_time / total_time`
+4. Position: Non-intrusive location (e.g., bottom-right corner with padding)
+5. Should not overlap with YOLO detection boxes
+
+## Example
+```
+[Current frame]                     [00:01:23 / 00:05:30]
+```
+
+## Implementation Notes
+- Use cv2.putText() to render the time overlay
+- Add padding/margin from edges to avoid covering video content
+- Consider using a semi-transparent background for better visibility
+- Make text color configurable or auto-contrast based on video content