feat: 包场预约网格改为1小时粒度+动态价格显示+锁场状态

- 时间线位置 /30 改为 /60
- 价格预览改为按格子累加 slot_prices
- 格子内显示价格（¥xx）
- 新增 locked（锁场）和 no_price（无价格）格子状态
- API映射层移除 unit_price，新增 slot_prices 和 source_type
- 确认页半小时段改为时段

miniprogram/src/modules/comprehensive/api/privateBooking.js

@@ -46,10 +46,8 @@ const toPrivateBookingOptions = (backendData = {}) => ({
   court_type_label: backendData.court_type_label || '',
   open_time: backendData.open_time || '',
   close_time: backendData.close_time || '',
-  unit_price: backendData.unit_price || '0.00',
-  duration_units: toNumber(backendData.duration_units, 2),
+  duration_units: toNumber(backendData.duration_units, 1),
   duration_minutes: toNumber(backendData.duration_minutes, 60),
-  amount_per_court: backendData.amount_per_court || '0.00',
   total_court_count: toNumber(backendData.total_court_count),
   time_options: toArray(backendData.time_options).map(toPrivateTimeOption)
 })
@@ -67,7 +65,8 @@ const toGridSlot = (backendSlot = {}) => ({
 const toGridOccupation = (backendOcc = {}) => ({
   court_id: backendOcc.court_id ?? null,
   start_at: backendOcc.start_at || '',
-  end_at: backendOcc.end_at || ''
+  end_at: backendOcc.end_at || '',
+  source_type: backendOcc.source_type || ''
 })
 
 const toPrivateBookingGrid = (backendData = {}) => ({
@@ -76,10 +75,10 @@ const toPrivateBookingGrid = (backendData = {}) => ({
   court_type_label: backendData.court_type_label || '',
   open_time: backendData.open_time || '',
   close_time: backendData.close_time || '',
-  unit_price: backendData.unit_price || '0.00',
   courts: toArray(backendData.courts).map(toGridCourt),
   time_slots: toArray(backendData.time_slots).map(toGridSlot),
-  occupations: toArray(backendData.occupations).map(toGridOccupation)
+  occupations: toArray(backendData.occupations).map(toGridOccupation),
+  slot_prices: backendData.slot_prices || {}
 })
 
 export const privateBookingApi = {