feat: Implement video generation functionality and integrate with Kling API.

api/models/VideoGenerationRequest.py

@@ -0,0 +1,16 @@
+from typing import Optional
+
+from pydantic import BaseModel
+
+
+class VideoGenerationRequest(BaseModel):
+    prompt: str = ""
+    negative_prompt: Optional[str] = ""
+    image_asset_id: str  # ID ассета-картинки для source image
+    duration: int = 5  # 5 or 10 seconds
+    mode: str = "std"  # "std" or "pro"
+    model_name: str = "kling-v2-1"
+    cfg_scale: float = 0.5
+    aspect_ratio: str = "16:9"
+    linked_character_id: Optional[str] = None
+    project_id: Optional[str] = None