Implement video processing module with FFmpeg conversion, OpenCV metadata extraction, and file system repository

- Added FFmpegVideoConverter for video format conversion using FFmpeg.
- Implemented NoOpVideoConverter for scenarios where FFmpeg is unavailable.
- Created OpenCVMetadataExtractor for extracting video metadata.
- Developed FileSystemVideoRepository for managing video files in the file system.
- Integrated video services with dependency injection in VideoModule.
- Established API routes for video management and streaming.
- Added request/response schemas for video metadata and streaming information.
- Implemented caching mechanisms for video streaming.
- Included error handling and logging throughout the module.

usda_vision_system/video/domain/__init__.py

@@ -0,0 +1,18 @@
+"""
+Video Domain Layer.
+
+Contains pure business logic and domain models for video operations.
+No external dependencies - only Python standard library and domain concepts.
+"""
+
+from .models import VideoFile, VideoMetadata, StreamRange
+from .interfaces import VideoRepository, VideoConverter, MetadataExtractor
+
+__all__ = [
+    "VideoFile",
+    "VideoMetadata",
+    "StreamRange", 
+    "VideoRepository",
+    "VideoConverter",
+    "MetadataExtractor",
+]