Initial commit: Expo app with Better Auth integration

- Complete Expo React Native app setup with TypeScript
- Better Auth authentication system integration
- Secure storage implementation for session tokens
- Authentication flow with login/logout functionality
- API client configuration for backend communication
- Responsive UI components with themed styling
- Expo Router navigation setup
- Development configuration and scripts

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

components/auth/debug-session.tsx

@@ -0,0 +1,119 @@
+import { ThemedText } from "@/components/themed-text";
+import { ThemedView } from "@/components/themed-view";
+import { storage } from "@/lib/storage";
+import { useEffect, useState } from "react";
+import { Alert, StyleSheet, TouchableOpacity, View } from "react-native";
+
+export function DebugSession() {
+  const [sessionToken, setSessionToken] = useState<string | null>(null);
+
+  const loadSessionToken = async () => {
+    try {
+      const token = storage.getItem("bestaibest.better-auth.session_token");
+      setSessionToken(token);
+    } catch (error) {
+      console.error("Error loading session token:", error);
+    }
+  };
+
+  useEffect(() => {
+    loadSessionToken();
+  }, []);
+
+  const handleRefresh = () => {
+    loadSessionToken();
+  };
+
+  const handleClear = async () => {
+    Alert.alert("清除会话", "确定要清除 SecureStore 中的会话数据吗？", [
+      { text: "取消", style: "cancel" },
+      {
+        text: "确定",
+        style: "destructive",
+        onPress: async () => {
+          console.log("[DebugSession] Clearing session token...");
+          storage.removeItem("bestaibest.better-auth.session_token");
+          
+          setTimeout(() => {
+            console.log("[DebugSession] Reloading token to verify...");
+            loadSessionToken();
+          }, 100);
+          
+          Alert.alert("成功", "会话已清除");
+        },
+      },
+    ]);
+  };
+
+  return (
+    <ThemedView style={styles.container}>
+      <ThemedText type="subtitle" style={styles.title}>
+        调试信息
+      </ThemedText>
+
+      <View style={styles.infoRow}>
+        <ThemedText style={styles.label}>Session Token:</ThemedText>
+        <ThemedText style={styles.value} numberOfLines={1}>
+          {sessionToken ? `${sessionToken.slice(0, 20)}...` : "无"}
+        </ThemedText>
+      </View>
+
+      <View style={styles.actions}>
+        <TouchableOpacity style={styles.button} onPress={handleRefresh}>
+          <ThemedText style={styles.buttonText}>刷新</ThemedText>
+        </TouchableOpacity>
+        <TouchableOpacity
+          style={[styles.button, styles.dangerButton]}
+          onPress={handleClear}
+        >
+          <ThemedText style={styles.buttonText}>清除会话</ThemedText>
+        </TouchableOpacity>
+      </View>
+    </ThemedView>
+  );
+}
+
+const styles = StyleSheet.create({
+  container: {
+    padding: 16,
+    borderRadius: 8,
+    borderWidth: 1,
+    borderColor: "#ddd",
+    marginVertical: 16,
+  },
+  title: {
+    marginBottom: 12,
+  },
+  infoRow: {
+    marginBottom: 8,
+  },
+  label: {
+    fontWeight: "600",
+    marginBottom: 4,
+  },
+  value: {
+    fontFamily: "monospace",
+    fontSize: 12,
+    opacity: 0.7,
+  },
+  actions: {
+    flexDirection: "row",
+    gap: 8,
+    marginTop: 12,
+  },
+  button: {
+    flex: 1,
+    backgroundColor: "#007AFF",
+    padding: 12,
+    borderRadius: 6,
+    alignItems: "center",
+  },
+  dangerButton: {
+    backgroundColor: "#FF3B30",
+  },
+  buttonText: {
+    color: "#fff",
+    fontWeight: "600",
+    fontSize: 14,
+  },
+});