feat: Implement Food Camera Screen and Floating Food Overlay

- Added FoodCameraScreen for capturing food images with camera functionality.
- Integrated image picker for selecting images from the gallery.
- Created FloatingFoodOverlay for quick access to food library and scanning options.
- Updated NutritionRadarCard to utilize FloatingFoodOverlay for adding food.
- Enhanced ExploreScreen layout and styles for better user experience.
- Removed unused SafeAreaView from ExploreScreen.
- Updated profile edit screen to remove unnecessary state variables.
- Updated avatar image source in profile edit screen.
- Added ExpoCamera dependency for camera functionalities.

app/profile/edit.tsx

@@ -70,9 +70,6 @@ export default function EditProfileScreen() {
     activityLevel: undefined,
   });
 
-  const [weightInput, setWeightInput] = useState<string>('');
-  const [heightInput, setHeightInput] = useState<string>('');
-
   // 出生日期选择器
   const [datePickerVisible, setDatePickerVisible] = useState(false);
   const [pickerDate, setPickerDate] = useState<Date>(new Date());
@@ -115,8 +112,7 @@ export default function EditProfileScreen() {
       }
       console.log('loadLocalProfile', next);
       setProfile((prev) => ({ ...next, avatarUri: prev.avatarUri ?? next.avatarUri ?? null }));
-      setWeightInput(next.weight != null ? String(round(next.weight, 1)) : '');
-      setHeightInput(next.height != null ? String(Math.round(next.height)) : '');
+
     } catch (e) {
       console.warn('读取资料失败', e);
     }
@@ -276,7 +272,7 @@ export default function EditProfileScreen() {
           <View style={{ alignItems: 'center', marginTop: 4, marginBottom: 32 }}>
             <TouchableOpacity activeOpacity={0.85} onPress={pickAvatarFromLibrary} disabled={uploading}>
               <View style={styles.avatarCircle}>
-                <Image source={{ uri: profile.avatarUri || 'https://plates-1251306435.cos.ap-guangzhou.myqcloud.com/images/avatar/avatarGirl01.jpeg' }} style={styles.avatarImage} />
+                <Image source={{ uri: profile.avatarUri || 'https://plates-1251306435.cos.ap-guangzhou.myqcloud.com/images/seal-avatar/2.jpeg' }} style={styles.avatarImage} />
                 <View style={styles.avatarOverlay}>
                   <Ionicons name="camera" size={22} color="#192126" />
                 </View>
@@ -394,11 +390,11 @@ export default function EditProfileScreen() {
               } else if (field === 'height') {
                 updatedProfile.height = parseFloat(value) || undefined;
                 setProfile(p => ({ ...p, height: parseFloat(value) || undefined }));
-                setHeightInput(value);
+
               } else if (field === 'weight') {
                 updatedProfile.weight = parseFloat(value) || undefined;
                 setProfile(p => ({ ...p, weight: parseFloat(value) || undefined }));
-                setWeightInput(value);
+
               } else if (field === 'activity') {
                 const activityLevel = parseInt(value) as number;
                 updatedProfile.activityLevel = activityLevel;