fix: use correct mode values for Kling 3.0 Motion Control

The Kie docs have contradictory info — the parameter description says
"std"/"pro" but the example request body uses "720p"/"1080p". The API
actually accepts "720p"/"1080p" (same as Kling 2.6 Motion Control),
rejecting "std"/"pro" with "mode is not within the range of allowed
options."

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

src/app/api/generate/providers/kie.ts

@@ -137,7 +137,7 @@ export function getKieModelDefaults(modelId: string): Record<string, unknown> {
     // Kling 3.0 motion control
     case "kling-3.0/motion-control":
       return {
-        mode: "pro",
+        mode: "720p",
         character_orientation: "video",
         background_source: "input_video",
       };

src/app/api/models/[modelId]/route.ts

@@ -988,7 +988,7 @@ function getKieSchema(modelId: string): ExtractedSchema {
     },
     "kling-3.0/motion-control": {
       parameters: [
-        { name: "mode", type: "string", description: "Generation mode", enum: ["std", "pro"], default: "pro" },
+        { name: "mode", type: "string", description: "Output resolution", enum: ["720p", "1080p"], default: "720p" },
         { name: "character_orientation", type: "string", description: "Character orientation source", enum: ["image", "video"], default: "video" },
         { name: "background_source", type: "string", description: "Background source", enum: ["input_video", "input_image"], default: "input_video" },
       ],