Add Rate Monitor app — Booking.com + direct booking engine competitor rates

Combines Booking.com Playwright scraper (from forecasting), direct booking
engine scraper (ported from laptop-archive/guestline-monitor), and Newbook
own-hotel rates into one focused tool. Four views: Bookability, Market View
(with price index badges + direct rate sub-rows), Direct Rates (per-competitor
room breakdown, min-stay flags, hotel config/discovery), Rate Analysis
(advance purchase curve, DOW chart, rate timeline, comparison table).

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

backend/services/direct_profiles/guestline.py

@@ -0,0 +1,49 @@
+import re
+from datetime import date, timedelta
+from .base import BaseProfile
+
+HEADERS = {
+    "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36",
+    "Accept": "application/json",
+}
+
+
+class GuestlineProfile(BaseProfile):
+    name = "guestline"
+    label = "Guestline"
+    required_params = [
+        {"key": "hotel_id",       "label": "Hotel ID",       "help": "e.g. THREEWAYS — from the booking URL ?hotel= parameter"},
+        {"key": "collection_id",  "label": "Collection ID",  "help": "e.g. MT — the path segment before /availability in the booking URL"},
+    ]
+
+    @classmethod
+    def detect(cls, url: str) -> dict | None:
+        # Matches: https://booking.eu.guestline.app/MT/availability?hotel=THREEWAYS
+        m = re.search(r'booking\.(?:eu\.)?guestline\.app/([^/?\s]+)/availability\?hotel=([^&\s]+)', url)
+        if m:
+            return {"collection_id": m.group(1), "hotel_id": m.group(2)}
+        return None
+
+    async def fetch_arrival_dates(self, client, params: dict) -> list[str]:
+        hotel_id = params["hotel_id"]
+        today = date.today()
+        url = f"https://booking.eu.guestline.app/api/availabilities/{hotel_id}/arrivals"
+        r = await client.get(url, params={
+            "month": today.month, "year": today.year,
+            "adults": 2, "children": 0, "count": 12,
+        }, headers=HEADERS, timeout=20)
+        r.raise_for_status()
+        return [a["date"] for a in r.json().get("arrivals", [])]
+
+    async def fetch_night_rates(self, client, params: dict, arrival: str, nights: int = 1) -> list[dict]:
+        hotel_id = params["hotel_id"]
+        collection_id = params.get("collection_id", "MT")
+        dep = (date.fromisoformat(arrival) + timedelta(days=nights)).isoformat()
+        url = f"https://booking.eu.guestline.app/api/availabilities/{collection_id}/{hotel_id}/enhanced"
+        r = await client.get(url, params={
+            "arrival": arrival, "departure": dep, "adults": 2, "children": 0,
+        }, headers=HEADERS, timeout=20)
+        if r.status_code == 404:
+            return []
+        r.raise_for_status()
+        return r.json().get("availabilities", {}).get("rooms", [])