[refactor]: migrate examples/scripts to typed VideoGenerator API; rename api/compat.py to api/translation.py

Move all examples/inference and scripts off the legacy
VideoGenerator.from_pretrained(model, **kwargs) +
generate_video(prompt, **kwargs) surface onto the typed
from_config(GeneratorConfig(...)) + generate(GenerationRequest(...))
convention, including the Kandinsky-5 and DreamX-World examples added
on main after the original migration. git-mv api/compat.py to
api/translation.py ('compat' implied a temporary shim; the forward
translation is its honest permanent role) and repoint all importers,
tests, and doc links.

examples/inference/basic/basic_wan2_2_i2v.py

@@ -1,6 +1,8 @@
 from fastvideo import VideoGenerator
-
-# from fastvideo.api.sampling_param import SamplingParam
+from fastvideo.api import (
+    EngineConfig, GenerationRequest, GeneratorConfig, InputConfig,
+    OffloadConfig, OutputConfig, SamplingConfig,
+)
 
 OUTPUT_PATH = "video_samples_wan2_2_14B_i2v"
 def main():
@@ -8,23 +10,36 @@ def main():
     # model.
     # If a local path is provided, FastVideo will make a best effort
     # attempt to identify the optimal arguments.
-    generator = VideoGenerator.from_pretrained(
-        "Wan-AI/Wan2.2-I2V-A14B-Diffusers",
-        # FastVideo will automatically handle distributed setup
-        num_gpus=1,
-        use_fsdp_inference=False, # set to True if GPU is out of memory
-        dit_cpu_offload=True, # DiT need to be offloaded for MoE
-        vae_cpu_offload=False,
-        text_encoder_cpu_offload=True,
-        # Set pin_cpu_memory to false if CPU RAM is limited and there're no frequent CPU-GPU transfer
-        pin_cpu_memory=True,
-        # image_encoder_cpu_offload=False,
+    generator = VideoGenerator.from_config(
+        GeneratorConfig(
+            model_path="Wan-AI/Wan2.2-I2V-A14B-Diffusers",
+            # FastVideo will automatically handle distributed setup
+            engine=EngineConfig(
+                num_gpus=1,
+                use_fsdp_inference=False,  # set to True if GPU is out of memory
+                offload=OffloadConfig(
+                    dit=True,  # DiT need to be offloaded for MoE
+                    vae=False,
+                    text_encoder=True,
+                    # Set pin_cpu_memory to false if CPU RAM is limited and there're no frequent CPU-GPU transfer
+                    pin_cpu_memory=True,
+                    # image_encoder=False,
+                ),
+            ),
+        )
     )
 
     prompt = "Summer beach vacation style, a white cat wearing sunglasses sits on a surfboard. The fluffy-furred feline gazes directly at the camera with a relaxed expression. Blurred beach scenery forms the background featuring crystal-clear waters, distant green hills, and a blue sky dotted with white clouds. The cat assumes a naturally relaxed posture, as if savoring the sea breeze and warm sunlight. A close-up shot highlights the feline's intricate details and the refreshing atmosphere of the seaside."
     image_path = "https://huggingface.co/datasets/YiYiXu/testing-images/resolve/main/wan_i2v_input.JPG"
 
-    video = generator.generate_video(prompt, image_path=image_path, output_path=OUTPUT_PATH, save_video=True, height=832, width=480, num_frames=81)
+    video = generator.generate(
+        GenerationRequest(
+            prompt=prompt,
+            inputs=InputConfig(image_path=image_path),
+            sampling=SamplingConfig(height=832, width=480, num_frames=81),
+            output=OutputConfig(output_path=OUTPUT_PATH, save_video=True),
+        )
+    )
 
 if __name__ == "__main__":
-    main()
+    main()