feat(pre-planting): Mobile App 预种购买页面完整实现

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[2026-02-17] 预种计划购买页面 (pre_planting_purchase_page.dart)

完整功能：
- 并行加载数据（余额 + 配置 + 资格 + 持仓）
- 余额卡片：显示绿积分可用余额，支持刷新
- 合并进度卡片：显示当前 N/5 份进度条 + 已合成树数
- 省市选择：首次购买使用 city_pickers 选择，续购自动锁定复用
- 份数选择器：+/- 按钮 + 输入框，自动校验余额和资格限制
- 价格明细：单价 3171 USDT、最大可购买数、本次总价
- 购买确认弹窗：含合并预告（购买后将自动合成提示）
- 开关关闭禁用态：显示不可购买原因
- 错误重试、加载中状态完备

UI 风格与现有认种页面 (planting_quantity_page) 完全一致：
- 渐变背景 (#FFF7E6 → #EAE0C8)
- 金色主色调 (#D4AF37)
- 棕色文字 (#5D4037)
- 卡片容器带阴影

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

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hailin 2026-02-18 05:38:44 -08:00

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frontend/mobile-app/lib/features/pre_planting/presentation/pages/pre_planting_purchase_page.dart

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