feat: Add comprehensive video operations support

[nedanwr]

Description

This PR introduces a complete video operations feature set to ForgeKit, enabling users to perform a wide range of video editing and processing tasks through the CLI. The implementation includes:

• Video Transcoding: Convert videos to H.264 format with customizable quality settings (CRF), encoding presets, scaling options, and audio re-encoding support
• Video Trimming: Fast stream-copy based trimming with flexible time format support (seconds, MM:SS, HH:MM:SS)
• Video Joining: Concatenate multiple video files with glob pattern support and natural sorting
• Format Conversion: Convert between video formats (gif, webm, mp4, mov, avi, mkv) with enhanced GIF quality using palette generation
• Thumbnail Extraction: Extract single frames from videos at specified timestamps
• Speed Adjustment: Change video playback speed (slow-motion, timelapse) with audio synchronization
• Rotation: Rotate videos by 90°, 180°, or 270° clockwise
• Audio Muting: Remove audio tracks from video files
• Image Sequence Stitching: Create videos or GIFs from image sequences with configurable frame rate and output format
• Video Information: Display detailed video metadata (duration, resolution, codec, bitrate, frame rate)

The implementation includes a new video command module in the CLI with 10 subcommands, comprehensive FFmpeg integration in the core library, and full job specification and execution support. All operations support planning mode (--plan) and JSON output (--json) for integration with other tools.

Type of Change

• feat: New feature
• fix: Bug fix
• docs: Documentation only
• refactor: Code refactoring (no behavior change)
• perf: Performance improvement
• test: Adding or updating tests
• build: Build system or dependencies
• ci: CI/workflow changes
• chore: Maintenance tasks

Scope

• cli - CLI commands and interface
• core - Core library functionality
• tools - Tool integrations (qpdf, ghostscript, etc.)
• pdf - PDF-specific operations
• packaging - Package configurations
• Other:

Related Issues

Checklist

• I have read the commit convention
• My commits follow the conventional format: type(scope): description
• I have added/updated tests as appropriate
• All tests pass locally (cargo test)
• Code passes lint checks (cargo clippy and cargo fmt)
• I have updated documentation if needed

Breaking Changes

• This PR contains breaking changes

Screenshots / Output

Example Commands

# Transcode video with quality control
forgekit video transcode video.mov --output video.mp4 --crf 20 --preset slow

# Trim video using stream copy (fast, no re-encoding)
forgekit video trim video.mp4 --start 0:30 --end 2:00 --output clip.mp4

# Join multiple videos with glob pattern
forgekit video join "part_*.mp4" --output full.mp4

# Convert to GIF with quality improvements
forgekit video convert video.mp4 -t gif --start 10 --duration 5 --width 480 --fps 15 --output clip.gif

# Stitch image sequence into video
forgekit video stitch "frame_*.png" -t mp4 --fps 24 --output animation.mp4

# Extract thumbnail
forgekit video thumbnail video.mp4 --time 1:30 --output preview.jpg

# Adjust playback speed
forgekit video speed video.mp4 --speed 2 --output fast.mp4

# Rotate video
forgekit video rotate video.mp4 --degrees 90 --output rotated.mp4

# Remove audio
forgekit video mute video.mp4 --output silent.mp4

# Show video information
forgekit video info video.mp4 --json

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