refactor(App, navigation): migrate to Expo Router and clean up navigation structure

- Updated App entry point to utilize Expo Router, simplifying the navigation setup.
- Removed legacy navigation components and services to streamline the codebase.
- Adjusted package.json to reflect the new entry point and updated dependencies for compatibility.
- Enhanced overall application structure by consolidating navigation logic and improving maintainability.

app/(app)/(tabs)/schedule/_layout.tsx

@@ -0,0 +1,17 @@
+import { Stack } from 'expo-router';
+
+export default function ScheduleStackLayout() {
+  return (
+    <Stack screenOptions={{ headerShown: false }}>
+      <Stack.Screen name="index" />
+      <Stack.Screen
+        name="course"
+        options={{
+          headerShown: false,
+          presentation: 'transparentModal',
+          animation: 'fade',
+        }}
+      />
+    </Stack>
+  );
+}

app/(app)/(tabs)/schedule/course.tsx

@@ -0,0 +1,5 @@
+import { CourseDetailScreen } from '../../../../src/screens/schedule';
+
+export default function CourseDetailRoute() {
+  return <CourseDetailScreen />;
+}

app/(app)/(tabs)/schedule/index.tsx

@@ -0,0 +1,5 @@
+import { ScheduleScreen } from '../../../../src/screens/schedule';
+
+export default function ScheduleRoute() {
+  return <ScheduleScreen />;
+}