feat: initial implementation — all 35 requirements across phases 1-3

Backend (Spring Boot 3.2 / Java 21 / PostgreSQL):
- JWT auth with BCrypt password hashing
- User profile + Mifflin-St Jeor BMR calculator
- Food search + barcode via OpenFoodFacts API with local cache
- Meal CRUD with user data isolation and ownership checks
- AI photo analysis (OpenAI Vision) with confidence intervals
- AI correction feedback loop for personalisation
- Flyway DB migrations + RFC-7807 error responses

Mobile (React Native / TypeScript):
- Full navigation stack (Auth → Tabs → Home stack)
- Design tokens (WCAG 2.2 AA colours, 8px grid, 48px touch targets)
- 10 screens: Login, Register, Home, Search, Camera, AI Result, Edit Meal,
  Daily Details, History, Profile
- Confidence-aware calorie display (kcal ± range)
- Repeat last meal shortcut + macro tracking

Docs:
- docs/PLAN-AND-REQUIREMENTS.md
- docs/traceability.csv (35 requirements, all Implemented)

mobile/src/components/FoodRow.tsx

@@ -0,0 +1,42 @@
+// Generated by GitHub Copilot
+import React from 'react';
+import { View, Text, TouchableOpacity, StyleSheet } from 'react-native';
+import { FoodItem } from '../services/api';
+import { Colors } from '../theme/colors';
+import { Spacing } from '../theme/spacing';
+
+interface FoodRowProps {
+  item: FoodItem;
+  onSelect: (item: FoodItem) => void;
+}
+
+/**
+ * Single food result row in the search screen.
+ * REQ-MOB-006
+ */
+export default function FoodRow({ item, onSelect }: FoodRowProps) {
+  return (
+    <TouchableOpacity
+      style={styles.row}
+      onPress={() => onSelect(item)}
+      accessibilityRole="button"
+      accessibilityLabel={`${item.name}, ${item.caloriesPer100g} calories per 100 grams`}
+    >
+      <Text style={styles.name}>{item.name}</Text>
+      <Text style={styles.kcal}>{item.caloriesPer100g} kcal / 100g</Text>
+    </TouchableOpacity>
+  );
+}
+
+const styles = StyleSheet.create({
+  row: {
+    minHeight: Spacing.touchTarget,
+    paddingHorizontal: Spacing.md,
+    paddingVertical: Spacing.sm,
+    borderBottomWidth: 1,
+    borderBottomColor: Colors.gray100,
+    justifyContent: 'center',
+  },
+  name: { fontSize: 16, fontWeight: '500', color: Colors.gray900 },
+  kcal: { fontSize: 13, color: Colors.gray500, marginTop: 2 },
+});