{"name":"claim_to_formula","name_zh":"目标反推配方","description":"从消费者目标反推配方 (5 个活性 + 浓度 + 基质)。例: '敏感肌修护 ¥300' → 完整配方 brief。","method":"POST","input":{"claim_id":"string (one of available_claims.id)","concerns":"string (Chinese or English keyword, e.g. '美白', 'whitening')","population":"adult|pregnant|child|sensitive","price_tier":"drugstore|mid|premium|luxury","lang":"'zh' | 'en' (default: from cookie)"},"output":{"claim":"{ id, name, target_demo }","actives":"[{ inci, pct, role_zh }]","avoid":"[string] - ingredients to avoid","vehicle":"string - recommended vehicle/base","notes":"string - formulation notes","population_note":"string - special population warnings"},"available_claims":[{"id":"sensitive_repair","name_en":"Sensitive Repair","icon":"🛡️","target_demo":"20-45 敏感肌, 屏障受损","actives_count":5},{"id":"whitening_brightening","name_en":"Whitening / Brightening","icon":"✨","target_demo":"20-40 暗沉 / 痘印 / 色斑","actives_count":5},{"id":"anti_aging","name_en":"Anti-aging / Anti-wrinkle","icon":"🌟","target_demo":"30+ 细纹 / 弹性下降","actives_count":6},{"id":"anti_acne","name_en":"Anti-acne / Oil Control","icon":"🧹","target_demo":"15-30 油痘肌","actives_count":6},{"id":"hydrating","name_en":"Hydration","icon":"💧","target_demo":"全龄 干燥 / 缺水","actives_count":6},{"id":"barrier_repair","name_en":"Barrier Repair","icon":"🏰","target_demo":"屏障受损 / 玫瑰痤疮 / 激素脸","actives_count":6},{"id":"antioxidant_anti_pollution","name_en":"Antioxidant / Anti-pollution","icon":"🛡️","target_demo":"城市通勤 / 25+ 抗光老","actives_count":6},{"id":"sunscreen","name_en":"Sunscreen (SPF 30+)","icon":"☀️","target_demo":"全龄 / 每天必备","actives_count":6},{"id":"exfoliation","name_en":"Exfoliation / Resurfacing","icon":"🌿","target_demo":"耐受肌 / 暗沉 / 痘印","actives_count":6},{"id":"anti_hair_loss","name_en":"Anti Hair Loss","icon":"💆","target_demo":"25-50 男女脱发","actives_count":6}]}