[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_ltx2_distilled.py

@@ -1,4 +1,5 @@
 from fastvideo import VideoGenerator
+from fastvideo.api import EngineConfig, GenerationRequest, GeneratorConfig, OutputConfig
 
 PROMPT = (
     "A warm sunny backyard. The camera starts in a tight cinematic close-up "
@@ -17,16 +18,19 @@ import os
 os.environ["FASTVIDEO_ATTENTION_BACKEND"] = "FLASH_ATTN"
 
 def main() -> None:
-    generator = VideoGenerator.from_pretrained(
-        "FastVideo/LTX2-Distilled-Diffusers",
-        num_gpus=4,
+    generator = VideoGenerator.from_config(
+        GeneratorConfig(
+            model_path="FastVideo/LTX2-Distilled-Diffusers",
+            engine=EngineConfig(num_gpus=4),
+        )
     )
 
     output_path = "outputs_video/ltx2_basic/output_ltx2_distilled_t2v.mp4"
-    generator.generate_video(
-        prompt=PROMPT,
-        output_path=output_path,
-        save_video=True,
+    generator.generate(
+        GenerationRequest(
+            prompt=PROMPT,
+            output=OutputConfig(output_path=output_path, save_video=True),
+        )
     )
     generator.shutdown()