feat(app): auth route groups, Welcome stub, and wallet roadmap docs

Routing and UI:
- Add auth/AuthContext stub (isAuthenticated, signIn, signOut) and wrap the root layout with AuthProvider.
- Add Expo Router groups (auth) and (app): welcome placeholder at /welcome; guard (app) routes when logged out.
- Replace app/index with a redirect to /welcome or /home; move the previous wallet screen to (app)/home.
- Move AI screen under (app)/ai so /ai shares the same auth guard as home.
- Apply useColors() for background and text on home and AI for a consistent theme.

Documentation:
- Extend texts/wallet-implementation-roadmap-and-login-alignment.md with logged-in session storage, Welcome provider implementation (links and steps), Telegram Mini App vs web Continue with Telegram, and compliance notes.

Tooling:
- Add scripts/stop-cloudflared-service.ps1 to stop the Cloudflared Windows service with elevation.

Made-with: Cursor

Author: anriltine

app/(app)/_layout.tsx

@@ -0,0 +1,12 @@
+import { Redirect, Stack } from "expo-router";
+import { useAuth } from "../../auth/AuthContext";
+
+export default function AppGroupLayout() {
+  const { isAuthenticated } = useAuth();
+
+  if (!isAuthenticated) {
+    return <Redirect href="/welcome" />;
+  }
+
+  return <Stack screenOptions={{ headerShown: false }} />;
+}

app/ai.tsx app/(app)/ai.tsxapp/ai.tsx renamed to app/(app)/ai.tsx

@@ -1,17 +1,19 @@
 import React from "react";
 import { View, Text, StyleSheet } from "react-native";
 import { useLocalSearchParams } from "expo-router";
+import { useColors } from "../../ui/theme";
 
 export default function AiScreen() {
+  const colors = useColors();
   const { prompt } = useLocalSearchParams<{ prompt?: string }>();
 
   return (
-    <View style={styles.container}>
-      <Text style={styles.title}>AI</Text>
+    <View style={[styles.container, { backgroundColor: colors.background }]}>
+      <Text style={[styles.title, { color: colors.primary }]}>AI</Text>
       {prompt ? (
-        <Text style={styles.prompt}>Prompt: {prompt}</Text>
+        <Text style={[styles.prompt, { color: colors.primary }]}>Prompt: {prompt}</Text>
       ) : (
-        <Text style={styles.hint}>No prompt</Text>
+        <Text style={[styles.hint, { color: colors.secondary }]}>No prompt</Text>
       )}
     </View>
   );
@@ -30,10 +32,8 @@ const styles = StyleSheet.create({
   },
   prompt: {
     fontSize: 14,
-    color: "#333",
   },
   hint: {
     fontSize: 14,
-    color: "#888",
   },
 });