feat: early check-in / late checkout fees with room-level configuration

- DB migration 016: add early_checkin_fee, late_checkout_fee to rooms table
- Backend rooms: support new fee columns in POST/PATCH
- Backend hotel-settings GET: also returns check_in_time, check_out_time
- Room type + RoomPayload: add earlyCheckinFee, lateCheckoutFee fields
- RoomModal: add fee amount inputs in pricing section
- SettingsPage: add toggles for early_checkin_enabled / late_checkout_enabled
- BookingDetailPanel: on check-in shows fee warning + adds payment record if
  current time is before checkInTime and fee is set on the room; same logic
  for check-out after checkOutTime

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

backend/migrations/016_checkinout_fees.sql

@@ -0,0 +1,4 @@
+-- Add early check-in and late checkout fee fields to rooms
+ALTER TABLE rooms
+  ADD COLUMN IF NOT EXISTS early_checkin_fee DECIMAL(10,2) DEFAULT NULL,
+  ADD COLUMN IF NOT EXISTS late_checkout_fee DECIMAL(10,2) DEFAULT NULL;

backend/src/routes/hotel-settings.ts

@@ -24,14 +24,18 @@ const hotelSettings: FastifyPluginAsync = async (fastify) => {
       const hotelId = await getHotelId(slug)
       if (!hotelId) return reply.code(404).send({ error: 'Hotel not found' })
 
-      const { rows } = await db.query(
-        'SELECT key, value FROM hotel_settings WHERE hotel_id = $1',
-        [hotelId],
-      )
+      const [{ rows: settingsRows }, { rows: hotelRows }] = await Promise.all([
+        db.query('SELECT key, value FROM hotel_settings WHERE hotel_id = $1', [hotelId]),
+        db.query('SELECT check_in_time, check_out_time FROM hotels WHERE id = $1', [hotelId]),
+      ])
       const out: Record<string, unknown> = {}
-      for (const row of rows) {
+      for (const row of settingsRows) {
         out[row.key] = row.value
       }
+      if (hotelRows[0]) {
+        out.check_in_time  = hotelRows[0].check_in_time
+        out.check_out_time = hotelRows[0].check_out_time
+      }
       return out
     },
   )

backend/src/routes/rooms.ts

@@ -55,6 +55,7 @@ const rooms: FastifyPluginAsync = async (fastify) => {
     beds?: unknown; housekeeping_status?: string; sort_order?: number
     allow_hourly?: boolean; hourly_rate?: number; extra_place?: unknown
     child_policy?: unknown; description?: string; photos?: string[]
+    early_checkin_fee?: number; late_checkout_fee?: number
   } }>(
     '/api/hotels/:slug/rooms',
     { onRequest: [fastify.authenticate] },
@@ -74,15 +75,16 @@ const rooms: FastifyPluginAsync = async (fastify) => {
         amenities = [], name, category_id, bed_type = 'double',
         beds, housekeeping_status = 'clean', sort_order = 99,
         allow_hourly = false, hourly_rate, extra_place, child_policy,
-        description, photos = [],
+        description, photos = [], early_checkin_fee, late_checkout_fee,
       } = request.body
 
       const { rows } = await db.query(
         `INSERT INTO rooms
            (hotel_id, number, type, floor, max_guests, base_rate, amenities, name,
             category_id, bed_type, beds, housekeeping_status, sort_order,
-            allow_hourly, hourly_rate, extra_place, child_policy, description, photos)
-         VALUES ($1,$2,$3,$4,$5,$6,$7,$8,$9,$10,$11,$12,$13,$14,$15,$16,$17,$18,$19)
+            allow_hourly, hourly_rate, extra_place, child_policy, description, photos,
+            early_checkin_fee, late_checkout_fee)
+         VALUES ($1,$2,$3,$4,$5,$6,$7,$8,$9,$10,$11,$12,$13,$14,$15,$16,$17,$18,$19,$20,$21)
          RETURNING *`,
         [
           hotelId, number, type, floor, max_guests, base_rate,
@@ -92,6 +94,7 @@ const rooms: FastifyPluginAsync = async (fastify) => {
           extra_place ? JSON.stringify(extra_place) : null,
           child_policy ? JSON.stringify(child_policy) : null,
           description ?? null, photos,
+          early_checkin_fee ?? null, late_checkout_fee ?? null,
         ],
       )
       return reply.code(201).send(rows[0])
@@ -139,6 +142,7 @@ const rooms: FastifyPluginAsync = async (fastify) => {
         'amenities', 'name', 'category_id', 'bed_type', 'beds',
         'housekeeping_status', 'sort_order', 'allow_hourly', 'hourly_rate',
         'extra_place', 'child_policy', 'description', 'photos',
+        'early_checkin_fee', 'late_checkout_fee',
       ]
       const updates: string[] = []
       const values: unknown[] = []