i18n CreatePanel with genre picker, model selector, EditableSlider, and LoRA panel

Phase 4.3: Largest component change. Adds cascading genre picker using
Phase 3 style data, DiT model selector with backend sync, EditableSlider
for all numeric parameters, LoRA load/unload panel, bulk generate, vocal
gender selector. Batch size max kept at 4 (not 8), inference steps max
kept at 32 (not 200) to prevent OOM. Added LoRA API stubs to api.ts.
Added ditModel to GenerationParams type.

services/api.ts

@@ -332,6 +332,16 @@ export const generateApi = {
     status_message?: string;
     error?: string;
   }> => api('/api/generate/format', { method: 'POST', body: params, token }),
+
+  // LoRA management (requires ACE-Step training fork)
+  loadLora: (params: { lora_path: string }, token: string): Promise<{ message: string }> =>
+    api('/api/generate/lora/load', { method: 'POST', body: params, token }),
+
+  unloadLora: (token: string): Promise<{ message: string }> =>
+    api('/api/generate/lora/unload', { method: 'POST', token }),
+
+  setLoraScale: (params: { scale: number }, token: string): Promise<{ message: string }> =>
+    api('/api/generate/lora/scale', { method: 'POST', body: params, token }),
 };
 
 // Users API