✨ feat(nutriphi): add AI-powered nutrition tracking app

- NestJS backend with Gemini AI for food photo analysis
- SvelteKit web app with Svelte 5 runes
- Drizzle ORM schema for meals, goals, favorites, recommendations
- Unified auth pages using shared-auth-ui components
- Landing page with Astro
- Shared types and utilities package

apps/nutriphi/packages/shared/src/constants/index.ts

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+// Default daily recommended values (based on 2000 kcal diet)
+export const DEFAULT_DAILY_VALUES = {
+	calories: 2000,
+	protein: 50, // grams
+	carbohydrates: 275, // grams
+	fat: 78, // grams
+	fiber: 28, // grams
+	sugar: 50, // grams (max)
+	saturatedFat: 20, // grams (max)
+	// Vitamins
+	vitaminA: 900, // µg RAE
+	vitaminB1: 1.2, // mg
+	vitaminB2: 1.3, // mg
+	vitaminB3: 16, // mg
+	vitaminB5: 5, // mg
+	vitaminB6: 1.7, // mg
+	vitaminB7: 30, // µg
+	vitaminB9: 400, // µg
+	vitaminB12: 2.4, // µg
+	vitaminC: 90, // mg
+	vitaminD: 20, // µg
+	vitaminE: 15, // mg
+	vitaminK: 120, // µg
+	// Minerals
+	calcium: 1000, // mg
+	iron: 18, // mg
+	magnesium: 420, // mg
+	phosphorus: 700, // mg
+	potassium: 4700, // mg
+	sodium: 2300, // mg (max)
+	zinc: 11, // mg
+	copper: 0.9, // mg
+	manganese: 2.3, // mg
+	selenium: 55, // µg
+} as const;
+
+// Meal type labels
+export const MEAL_TYPE_LABELS = {
+	breakfast: {
+		de: 'Frühstück',
+		en: 'Breakfast',
+	},
+	lunch: {
+		de: 'Mittagessen',
+		en: 'Lunch',
+	},
+	dinner: {
+		de: 'Abendessen',
+		en: 'Dinner',
+	},
+	snack: {
+		de: 'Snack',
+		en: 'Snack',
+	},
+} as const;
+
+// Nutrient categories for UI grouping
+export const NUTRIENT_CATEGORIES = {
+	macros: ['calories', 'protein', 'carbohydrates', 'fat', 'fiber', 'sugar'],
+	vitamins: [
+		'vitaminA',
+		'vitaminB1',
+		'vitaminB2',
+		'vitaminB3',
+		'vitaminB5',
+		'vitaminB6',
+		'vitaminB7',
+		'vitaminB9',
+		'vitaminB12',
+		'vitaminC',
+		'vitaminD',
+		'vitaminE',
+		'vitaminK',
+	],
+	minerals: [
+		'calcium',
+		'iron',
+		'magnesium',
+		'phosphorus',
+		'potassium',
+		'sodium',
+		'zinc',
+		'copper',
+		'manganese',
+		'selenium',
+	],
+} as const;
+
+// Nutrient display info
+export const NUTRIENT_INFO = {
+	calories: { label: 'Kalorien', unit: 'kcal', color: '#F59E0B' },
+	protein: { label: 'Protein', unit: 'g', color: '#EF4444' },
+	carbohydrates: { label: 'Kohlenhydrate', unit: 'g', color: '#3B82F6' },
+	fat: { label: 'Fett', unit: 'g', color: '#8B5CF6' },
+	fiber: { label: 'Ballaststoffe', unit: 'g', color: '#10B981' },
+	sugar: { label: 'Zucker', unit: 'g', color: '#EC4899' },
+	vitaminA: { label: 'Vitamin A', unit: 'µg', color: '#F97316' },
+	vitaminC: { label: 'Vitamin C', unit: 'mg', color: '#FBBF24' },
+	vitaminD: { label: 'Vitamin D', unit: 'µg', color: '#A3E635' },
+	calcium: { label: 'Calcium', unit: 'mg', color: '#E5E7EB' },
+	iron: { label: 'Eisen', unit: 'mg', color: '#78716C' },
+	magnesium: { label: 'Magnesium', unit: 'mg', color: '#06B6D4' },
+} as const;
+
+// Credit costs per action
+export const CREDIT_COSTS = {
+	photoAnalysis: 5,
+	textAnalysis: 2,
+	aiCoaching: 10,
+} as const;
+
+// Theme colors
+export const NUTRIPHI_COLORS = {
+	primary: '#22C55E', // Green 500
+	primaryHover: '#16A34A', // Green 600
+	primaryLight: '#86EFAC', // Green 300
+	secondary: '#F97316', // Orange 500
+	accent: '#14B8A6', // Teal 500
+	background: '#0F1F0F', // Dark green tinted
+	backgroundCard: '#1A2F1A',
+	textPrimary: '#F0FDF4', // Green 50
+	textSecondary: '#BBF7D0', // Green 200
+	border: '#22543D', // Green 800
+} as const;