Update editor generation pricing defaults

Unify and lower default mud-point prices across editor generation features and update related API/schema, docs and tests. Changes set gpt-image-2 to 1K=3 / 2K=5, audio1.0 to 5, and chirp-v5 to 12, and update server default JSON, frontend models/workflows, OpenAPI schema (require aspectRatio/imageSize/priceMudPoints for UI extraction), multiple UX docs (quick-edit viewport, UI extraction panel, pricing guidance) and accompanying tests to match the new defaults and validation rules.

src/components/image-editor/ImageCanvasGenerationModel.ts

@@ -75,8 +75,8 @@ export const EDITOR_IMAGE_MODEL_MUD_POINT_CONFIG = {
     '2K': 24,
   },
   [IMAGE_MODEL_GPT_IMAGE_2]: {
-    '1K': 20,
-    '2K': 40,
+    '1K': 3,
+    '2K': 5,
   },
 } as const;
 export const SPEC_GENERATION_COST =
@@ -338,10 +338,10 @@ export const EDITOR_VIDEO_MODEL_MUD_POINT_CONFIG = {
   [VIDEO_MODEL_VEO_3_1_FAST]: EDITOR_VIDEO_RESOLUTION_RATE_CONFIG,
 } as const;
 export const EDITOR_SOUND_EFFECT_MODEL_MUD_POINT_CONFIG = {
-  [SOUND_EFFECT_MODEL_VIDU]: 10,
+  [SOUND_EFFECT_MODEL_VIDU]: 5,
 } as const;
 export const EDITOR_BACKGROUND_MUSIC_MODEL_MUD_POINT_CONFIG = {
-  [BACKGROUND_MUSIC_MODEL_SUNO]: 5,
+  [BACKGROUND_MUSIC_MODEL_SUNO]: 12,
 } as const;
 export const EDITOR_MODEL_MUD_POINT_CONFIG = {
   [IMAGE_MODEL_NANOBANANA2]: {