feat: A1 网络层与鉴权 + A2 账号登录对接

- 引入 dio，封装统一 ApiClient（BaseUrl/Token 注入/401 自动刷新/{code,message,data} 解包）
- TokenStorage 令牌持久化，AuthController 登录状态管理
- AuthRepository 封装 otp/login/logout 接口
- 登录页对接手机号/邮箱验证码登录（Google 登录待 OAuth client 配置）

lib/pages/login/login_view.dart

@@ -1,11 +1,12 @@
 // Author: fruit.com.cn
 
 import 'package:flutter/material.dart';
+import 'package:provider/provider.dart';
 
+import '../../core/data/services/auth_controller.dart';
 import '../home/home_view.dart';
 
 /// 登录页：Google / 手机号 / 邮箱 三种登录入口 + 游客浏览。
-/// 当前为 UI 占位实现，真实登录逻辑在接入后端 /app/auth/** 后补充。
 class LoginPage extends StatefulWidget {
   const LoginPage({super.key});
 
@@ -23,6 +24,132 @@ class _LoginPageState extends State<LoginPage> {
     );
   }
 
+  Future<void> _showLoginSheet(String targetType) async {
+    final auth = context.read<AuthController>();
+    final targetCtrl = TextEditingController();
+    final codeCtrl = TextEditingController();
+    final isPhone = targetType == 'PHONE';
+
+    await showModalBottomSheet<void>(
+      context: context,
+      isScrollControlled: true,
+      backgroundColor: const Color(0xFF161822),
+      builder: (sheetContext) => Padding(
+        padding: EdgeInsets.only(
+          bottom: MediaQuery.of(sheetContext).viewInsets.bottom,
+        ),
+        child: Padding(
+          padding: const EdgeInsets.all(24),
+          child: Column(
+            mainAxisSize: MainAxisSize.min,
+            crossAxisAlignment: CrossAxisAlignment.stretch,
+            children: [
+              Text(
+                isPhone ? 'Phone Login' : 'Email Login',
+                style: const TextStyle(
+                  fontSize: 18,
+                  fontWeight: FontWeight.w700,
+                  color: Colors.white,
+                ),
+              ),
+              const SizedBox(height: 16),
+              TextField(
+                controller: targetCtrl,
+                keyboardType: isPhone
+                    ? TextInputType.phone
+                    : TextInputType.emailAddress,
+                style: const TextStyle(color: Colors.white),
+                decoration: InputDecoration(
+                  hintText: isPhone ? 'Phone number' : 'Email',
+                  hintStyle: const TextStyle(color: Colors.white38),
+                  filled: true,
+                  fillColor: Colors.white.withValues(alpha: 0.05),
+                  border: OutlineInputBorder(
+                    borderRadius: BorderRadius.circular(12),
+                    borderSide: BorderSide.none,
+                  ),
+                ),
+              ),
+              const SizedBox(height: 12),
+              Row(
+                children: [
+                  Expanded(
+                    child: TextField(
+                      controller: codeCtrl,
+                      keyboardType: TextInputType.number,
+                      style: const TextStyle(color: Colors.white),
+                      decoration: InputDecoration(
+                        hintText: 'Code',
+                        hintStyle: const TextStyle(color: Colors.white38),
+                        filled: true,
+                        fillColor: Colors.white.withValues(alpha: 0.05),
+                        border: OutlineInputBorder(
+                          borderRadius: BorderRadius.circular(12),
+                          borderSide: BorderSide.none,
+                        ),
+                      ),
+                    ),
+                  ),
+                  const SizedBox(width: 12),
+                  TextButton(
+                    onPressed: () async {
+                      try {
+                        await auth.sendOtp(
+                          scene: 'LOGIN',
+                          targetType: targetType,
+                          target: targetCtrl.text.trim(),
+                        );
+                        if (sheetContext.mounted) {
+                          ScaffoldMessenger.of(sheetContext).showSnackBar(
+                            const SnackBar(content: Text('Code sent')),
+                          );
+                        }
+                      } catch (e) {
+                        if (sheetContext.mounted) {
+                          ScaffoldMessenger.of(sheetContext).showSnackBar(
+                            SnackBar(content: Text('$e')),
+                          );
+                        }
+                      }
+                    },
+                    child: const Text('Send Code'),
+                  ),
+                ],
+              ),
+              const SizedBox(height: 20),
+              FilledButton(
+                onPressed: () async {
+                  try {
+                    await auth.loginWithCode(
+                      targetType: targetType,
+                      target: targetCtrl.text.trim(),
+                      code: codeCtrl.text.trim(),
+                    );
+                    if (sheetContext.mounted) {
+                      Navigator.of(sheetContext).pop();
+                    }
+                    _enterHome();
+                  } catch (e) {
+                    if (sheetContext.mounted) {
+                      ScaffoldMessenger.of(sheetContext).showSnackBar(
+                        SnackBar(content: Text('$e')),
+                      );
+                    }
+                  }
+                },
+                style: FilledButton.styleFrom(
+                  backgroundColor: _orange,
+                  padding: const EdgeInsets.symmetric(vertical: 14),
+                ),
+                child: const Text('Sign In'),
+              ),
+            ],
+          ),
+        ),
+      ),
+    );
+  }
+
   @override
   Widget build(BuildContext context) {
     return Scaffold(
@@ -86,14 +213,14 @@ class _LoginPageState extends State<LoginPage> {
                         icon: Icons.phone_iphone,
                         iconColor: _orange,
                         label: 'Continue with Phone Number',
-                        onTap: _enterHome,
+                        onTap: () => _showLoginSheet('PHONE'),
                       ),
                       const SizedBox(height: 14),
                       _DarkButton(
                         icon: Icons.email_outlined,
                         iconColor: _purple,
                         label: 'Continue with Email',
-                        onTap: _enterHome,
+                        onTap: () => _showLoginSheet('EMAIL'),
                       ),
                       const SizedBox(height: 32),
                       const _BonusPill(),