fix: correct per-model video API field names and remove non-existent models

Each video model uses a different image input field:
- kling-o1-pro/std: first_frame (not image)
- kling-elements-pro/std: images (array)
- minimax-hailuo: image, duration fixed at "6"

Also:
- kling-elements requires slug aspect ratios (square_1_1, etc.)
- Remove wan-2.5 and runway-gen4 which return 404

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

freepik_cli/api/models.py

@@ -27,8 +27,6 @@ class VideoModel(str, Enum):
     KLING_ELEMENTS_PRO = "kling-elements-pro"
     KLING_ELEMENTS_STD = "kling-elements-std"
     MINIMAX_HAILUO = "minimax-hailuo"
-    WAN_2_5 = "wan-2.5"
-    RUNWAY_GEN4 = "runway-gen4"
 
 
 class UpscaleMode(str, Enum):
@@ -90,8 +88,6 @@ VIDEO_POST_ENDPOINTS: dict[VideoModel, str] = {
     VideoModel.KLING_ELEMENTS_PRO: "/v1/ai/image-to-video/kling-elements-pro",
     VideoModel.KLING_ELEMENTS_STD: "/v1/ai/image-to-video/kling-elements-std",
     VideoModel.MINIMAX_HAILUO: "/v1/ai/image-to-video/minimax-hailuo-02-1080p",
-    VideoModel.WAN_2_5: "/v1/ai/image-to-video/wan-2-5",
-    VideoModel.RUNWAY_GEN4: "/v1/ai/image-to-video/runway-gen4",
 }
 
 VIDEO_STATUS_ENDPOINTS: dict[VideoModel, str] = {
@@ -100,10 +96,36 @@ VIDEO_STATUS_ENDPOINTS: dict[VideoModel, str] = {
     VideoModel.KLING_ELEMENTS_PRO: "/v1/ai/image-to-video/kling-elements-pro/{task_id}",
     VideoModel.KLING_ELEMENTS_STD: "/v1/ai/image-to-video/kling-elements-std/{task_id}",
     VideoModel.MINIMAX_HAILUO: "/v1/ai/image-to-video/minimax-hailuo-02-1080p/{task_id}",
-    VideoModel.WAN_2_5: "/v1/ai/image-to-video/wan-2-5/{task_id}",
-    VideoModel.RUNWAY_GEN4: "/v1/ai/image-to-video/runway-gen4/{task_id}",
 }
 
+# Per-model image input field name
+VIDEO_IMAGE_FIELDS: dict[VideoModel, str] = {
+    VideoModel.KLING_O1_PRO: "first_frame",
+    VideoModel.KLING_O1_STD: "first_frame",
+    VideoModel.KLING_ELEMENTS_PRO: "images",    # expects an array
+    VideoModel.KLING_ELEMENTS_STD: "images",    # expects an array
+    VideoModel.MINIMAX_HAILUO: "image",
+}
+
+# Kling Elements requires named aspect ratio slugs
+VIDEO_SLUG_ASPECT_RATIO_MODELS: set[VideoModel] = {
+    VideoModel.KLING_ELEMENTS_PRO,
+    VideoModel.KLING_ELEMENTS_STD,
+}
+
+_VIDEO_RATIO_TO_SLUG: dict[str, str] = {
+    "1:1":  "square_1_1",
+    "16:9": "widescreen_16_9",
+    "9:16": "social_story_9_16",
+}
+
+
+def normalize_aspect_ratio_video(ratio: str, model: VideoModel) -> str:
+    """Convert a user-facing aspect ratio to the format required by the video model."""
+    if model not in VIDEO_SLUG_ASPECT_RATIO_MODELS:
+        return ratio
+    return _VIDEO_RATIO_TO_SLUG.get(ratio, ratio)
+
 UPSCALE_POST_ENDPOINTS: dict[UpscaleMode, str] = {
     UpscaleMode.CREATIVE: "/v1/ai/image-upscaler",
     UpscaleMode.PRECISION: "/v1/ai/image-upscaler-precision",