feat: improve subject generation workflow

api/character_library/skg-characters/manifest.json

@@ -8,6 +8,7 @@
       "name": "运动阳光男",
       "folder": "01_运动阳光男",
       "description": "运动阳光男透明骨架人角色，含正面、左右45度、侧面、背面、半身近景和背部特写参考。",
+      "prompt_brief": "Athletic sunny male transparent wellness character, young adult energy, lean fit proportions, open and upbeat posture, clean translucent skin shell with visible white skeleton. The character should feel friendly, active, outdoor-sport inspired, bright, healthy, and suitable for premium SKG neck-and-shoulder wearable device ads. Keep neck, collarbone, shoulders, upper back, and cervical spine readable without bulky clothing or props.",
       "primary_image": "character-01-front",
       "images": [
         {
@@ -80,6 +81,7 @@
       "name": "都市型男",
       "folder": "02_都市型男",
       "description": "都市型男透明骨架人角色，含正面、左右45度、侧面、背面、半身近景和背部特写参考。",
+      "prompt_brief": "Urban stylish male transparent wellness character, adult metropolitan feel, clean confident posture, refined proportions, translucent body shell with visible white skeleton. The commercial mood is premium city lifestyle, composed, sharp, and modern, suitable for office or commute-oriented SKG neck-and-shoulder massage ads. Keep shoulder line, side neck, collarbone, and upper back clear for wearable device placement.",
       "primary_image": "character-02-front",
       "images": [
         {
@@ -152,6 +154,7 @@
       "name": "优雅白领女",
       "folder": "03_优雅白领女",
       "description": "优雅白领女透明骨架人角色，含正面、左右45度、侧面、背面、半身近景和背部特写参考。",
+      "prompt_brief": "Elegant professional female transparent wellness character, young adult to adult office-worker mood, slim balanced proportions, calm poised posture, translucent outer body with a clean visible white skeleton. The style should feel premium, gentle, trustworthy, and workplace-friendly for SKG neck-and-shoulder wearable device ads. Keep hair, collars, and accessories from hiding the neck, shoulders, collarbone, upper back, and cervical spine.",
       "primary_image": "character-03-front",
       "images": [
         {
@@ -224,6 +227,7 @@
       "name": "运动辣妹",
       "folder": "04_运动辣妹",
       "description": "运动辣妹透明骨架人角色，含正面、左右45度、侧面、背面、半身近景和背部特写参考。",
+      "prompt_brief": "Sporty confident female transparent wellness character, energetic young adult fitness mood, toned proportions, expressive posture, translucent skin shell with visible white skeleton. The character should feel active, fashionable, bright, and creator-ad friendly while remaining premium and non-horror. Keep the neck, side neck, shoulders, collarbone, upper trapezius, and upper back open and readable for SKG wearable massage device scenes.",
       "primary_image": "character-04-front",
       "images": [
         {
@@ -296,6 +300,7 @@
       "name": "绅士大叔",
       "folder": "05_绅士大叔",
       "description": "绅士大叔透明骨架人角色，含正面、左右45度、侧面、背面、半身近景和背部特写参考。",
+      "prompt_brief": "Mature gentleman transparent wellness character, adult to middle-aged presence without exact age, steady confident posture, slightly stronger build, translucent body shell with a clean visible white skeleton. The commercial mood is calm, trustworthy, premium, and lifestyle-oriented for SKG neck-and-shoulder wearable device ads. Keep collars and styling minimal so the neck, shoulders, upper back, cervical spine, and shoulder blades remain visible.",
       "primary_image": "character-05-front",
       "images": [
         {
@@ -364,4 +369,4 @@
       ]
     }
   ]
-}
+}