feat: customer frontend, Sungrow collector fixes, real data (v1.2.0)

- Add frontend/ at root (no Three.js, no Charging, green #52c41a theme)
- Fix Sungrow collector: add curPage/size params, unit conversion
- Fix station-level dedup to prevent double-counting
- Add shared token cache for API rate limit protection
- Add .githooks/pre-commit, CLAUDE.md, .gitignore
- Update docker-compose.override.yml frontend -> ./frontend
- Pin bcrypt in requirements.txt
- Add BUYOFF_RESULTS_2026-04-05.md (39/43 pass)
- Data accuracy: 0.0% diff vs iSolarCloud

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/src/pages/Login/index.tsx

@@ -0,0 +1,88 @@
+import { useState } from 'react';
+import { Form, Input, Button, Card, message, Typography } from 'antd';
+import { UserOutlined, LockOutlined, ThunderboltOutlined } from '@ant-design/icons';
+import { useNavigate } from 'react-router-dom';
+import { login } from '../../services/api';
+import { setToken, setUser } from '../../utils/auth';
+
+const { Title, Text } = Typography;
+
+export default function LoginPage() {
+  const [loading, setLoading] = useState(false);
+  const [guestLoading, setGuestLoading] = useState(false);
+  const navigate = useNavigate();
+
+  const doLogin = async (username: string, password: string) => {
+    const res: any = await login(username, password);
+    setToken(res.access_token);
+    setUser(res.user);
+    return res;
+  };
+
+  const onFinish = async (values: { username: string; password: string }) => {
+    setLoading(true);
+    try {
+      await doLogin(values.username, values.password);
+      message.success('登录成功');
+      navigate('/');
+    } catch {
+      message.error('用户名或密码错误');
+    } finally {
+      setLoading(false);
+    }
+  };
+
+  const onGuestLogin = async () => {
+    setGuestLoading(true);
+    try {
+      await doLogin('visitor', 'visitor123');
+      message.success('访客登录成功');
+      navigate('/');
+    } catch {
+      message.error('访客登录失败，请联系管理员');
+    } finally {
+      setGuestLoading(false);
+    }
+  };
+
+  return (
+    <div style={{
+      minHeight: '100vh', display: 'flex', justifyContent: 'center', alignItems: 'center',
+      background: 'linear-gradient(135deg, #0a1628 0%, #1a3a5c 50%, #0d2137 100%)',
+    }}>
+      <Card style={{ width: 400, borderRadius: 12, boxShadow: '0 8px 32px rgba(0,0,0,0.3)' }}>
+        <div style={{ textAlign: 'center', marginBottom: 32 }}>
+          <ThunderboltOutlined style={{ fontSize: 48, color: '#1890ff' }} />
+          <Title level={3} style={{ marginTop: 12, marginBottom: 4 }}>
+            天普智慧能源管理平台
+          </Title>
+          <Text type="secondary">零碳园区 · 智慧运维</Text>
+        </div>
+        <Form onFinish={onFinish} size="large">
+          <Form.Item name="username" rules={[{ required: true, message: '请输入用户名' }]}>
+            <Input prefix={<UserOutlined />} placeholder="用户名" />
+          </Form.Item>
+          <Form.Item name="password" rules={[{ required: true, message: '请输入密码' }]}>
+            <Input.Password prefix={<LockOutlined />} placeholder="密码" />
+          </Form.Item>
+          <Form.Item>
+            <Button type="primary" htmlType="submit" loading={loading} block>
+              登 录
+            </Button>
+          </Form.Item>
+          <Form.Item style={{ marginBottom: 8 }}>
+            <Button block loading={guestLoading} onClick={onGuestLogin}
+              style={{ borderColor: '#1890ff', color: '#1890ff' }}>
+              访客体验入口
+            </Button>
+          </Form.Item>
+          <div style={{ textAlign: 'center' }}>
+            <Text type="secondary" style={{ fontSize: 12 }}>
+              访客仅可浏览数据，无管理权限
+            </Text>
+          </div>
+        </Form>
+      </Card>
+    </div>
+  );
+}