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.

apps/admin-web/src/pages/AdminEditorGenerationPricingPage.test.tsx

@@ -28,7 +28,7 @@ const pricing: EditorGenerationPricingConfigPayload = {
     },
     'gpt-image-2': {
       unit: 'perGeneration',
-      prices: {'1K': 20, '2K': 40},
+      prices: {'1K': 3, '2K': 5},
     },
     'seedance2.0-fast': {
       unit: 'perSecond',
@@ -38,8 +38,8 @@ const pricing: EditorGenerationPricingConfigPayload = {
       unit: 'perSecond',
       prices: {'480p': 12, '720p': 24, '1080p': 48},
     },
-    'audio1.0': {unit: 'perGeneration', price: 10},
-    'chirp-v5': {unit: 'perGeneration', price: 5},
+    'audio1.0': {unit: 'perGeneration', price: 5},
+    'chirp-v5': {unit: 'perGeneration', price: 12},
   },
 };