Ketogenic Diet Market Size, Share & Industry Analysis, By Type (Packaged Keto Foods & Beverages {Keto Snacks, Low-Carb Staples, Keto-Ready Meals, and Keto Beverages}, Keto Supplements & Nutraceuticals, and Keto Programs & Services), By Price Tier (Premium/Specialty and Mass Market), By End Use (Weight Management, Lifestyle/Fitness, and Medical), By Distribution Channel (Offline Retail, Online, and Healthcare/Fitness), and Regional Forecast, 2026-2034