Add model type filters and update MCP server

Features Added:
- Model type filters: --t2i-only, --v2v-only, --v2i-only, --3d-only, --tts-only, --audio-only
- Enhanced model list table with new capability columns (V2V, V2I, 3D, TTS)
- Updated detect_model_type() to detect all model capabilities

MCP Server Updates:
- Added videogen_video_to_video tool for V2V style transfer
- Added videogen_apply_video_filter tool for video filters
- Added videogen_extract_frames tool for frame extraction
- Added videogen_create_collage tool for thumbnail grids
- Added videogen_upscale_video tool for AI upscaling
- Added videogen_convert_3d tool for 2D-to-3D conversion
- Added videogen_concat_videos tool for video concatenation
- Updated model list filter to support all new types

SKILL.md Updates:
- Added V2V, V2I, 3D to generation types table
- Added model filter examples
- Added 8 new use cases for V2V, filters, frames, collage, upscale, 3D, concat

SKILL.md

@@ -13,6 +13,10 @@ VideoGen is a universal video generation toolkit that supports:
 - **Image-to-Video (I2V)**: Animate static images
 - **Text-to-Image (T2I)**: Generate images from text
 - **Image-to-Image (I2I)**: Transform existing images
+- **Video-to-Video (V2V)**: Style transfer and filters for videos
+- **Video-to-Image (V2I)**: Extract frames and keyframes from videos
+- **2D-to-3D Conversion**: Convert 2D videos to 3D SBS, anaglyph, or VR 360
+- **Video Upscaling**: AI-powered video upscaling
 - **Audio Generation**: TTS and music generation
 - **Lip Sync**: Synchronize lip movements with audio
 
@@ -64,6 +68,31 @@ python3 videogen --show-model <model_id_or_name>
 | I2V | `--image_to_video --model i2v_model --prompt "..."` | Animate an image |
 | T2I | `--model t2i_model --prompt "..." --output image.png` | Generate image |
 | I2I | `--image-to-image --image input.png --prompt "..."` | Transform image |
+| V2V | `--video input.mp4 --video-to-video --prompt "..."` | Style transfer on video |
+| V2I | `--video input.mp4 --extract-keyframes` | Extract frames from video |
+| 3D | `--video input.mp4 --convert-3d-sbs` | Convert 2D to 3D |
+
+### Model Filters
+
+```bash
+# List models by type
+python3 videogen --model-list --t2v-only      # Text-to-Video models
+python3 videogen --model-list --i2v-only      # Image-to-Video models
+python3 videogen --model-list --t2i-only      # Text-to-Image models
+python3 videogen --model-list --v2v-only      # Video-to-Video models
+python3 videogen --model-list --v2i-only      # Video-to-Image models
+python3 videogen --model-list --3d-only       # 2D-to-3D models
+python3 videogen --model-list --tts-only      # TTS models
+python3 videogen --model-list --audio-only    # Audio models
+
+# List by VRAM requirement
+python3 videogen --model-list --low-vram      # ≤16GB VRAM
+python3 videogen --model-list --high-vram    # >30GB VRAM
+python3 videogen --model-list --huge-vram    # >55GB VRAM
+
+# List NSFW-friendly models
+python3 videogen --model-list --nsfw-friendly
+```
 
 ### Auto Mode
 
@@ -144,6 +173,84 @@ python3 videogen --image_to_video --model svd_xt_1.1 \
   --lip_sync --output speaker
 ```
 
+### 8. Video-to-Video Style Transfer
+
+```bash
+# Apply style transfer to a video
+python3 videogen --video input.mp4 --video-to-video \
+  --prompt "make it look like a watercolor painting" \
+  --v2v-strength 0.7 --output styled
+```
+
+### 9. Apply Video Filter
+
+```bash
+# Apply grayscale filter
+python3 videogen --video input.mp4 --video-filter grayscale --output gray
+
+# Apply slow motion
+python3 videogen --video input.mp4 --video-filter slow \
+  --filter-params "factor=0.5" --output slowmo
+
+# Apply blur
+python3 videogen --video input.mp4 --video-filter blur \
+  --filter-params "radius=10" --output blurred
+```
+
+### 10. Extract Frames from Video
+
+```bash
+# Extract keyframes
+python3 videogen --video input.mp4 --extract-keyframes --frames-dir keyframes
+
+# Extract single frame at timestamp
+python3 videogen --video input.mp4 --extract-frame --timestamp 5.5 --output frame.png
+
+# Extract all frames
+python3 videogen --video input.mp4 --extract-frames --v2v-max-frames 100 --frames-dir all_frames
+```
+
+### 11. Create Video Collage
+
+```bash
+# Create 4x4 thumbnail grid
+python3 videogen --video input.mp4 --video-collage \
+  --collage-grid 4x4 --output collage.png
+```
+
+### 12. Upscale Video
+
+```bash
+# 2x upscale using ffmpeg
+python3 videogen --video input.mp4 --upscale-video \
+  --upscale-factor 2.0 --output upscaled
+
+# 4x upscale using AI (ESRGAN)
+python3 videogen --video input.mp4 --upscale-video \
+  --upscale-factor 4.0 --upscale-method esrgan --output upscaled_4k
+```
+
+### 13. Convert 2D to 3D
+
+```bash
+# Convert to side-by-side 3D for VR
+python3 videogen --video input.mp4 --convert-3d-sbs \
+  --depth-method ai --output 3d_sbs
+
+# Convert to anaglyph 3D (red/cyan glasses)
+python3 videogen --video input.mp4 --convert-3d-anaglyph --output anaglyph
+
+# Convert to VR 360 format
+python3 videogen --video input.mp4 --convert-vr --output vr360
+```
+
+### 14. Concatenate Videos
+
+```bash
+# Join multiple videos
+python3 videogen --concat-videos video1.mp4 video2.mp4 video3.mp4 --output joined
+```
+
 ---
 
 ## Model Selection Guide