Add benchmark & tier-offset configuration UI to Direct Rates Manage tab

- new GET /direct/hotels/{id}/config returns full hotel config plus
  distinct room/rate IDs from scraped data (and any known via labels)
- Configure panel: benchmark room/rate selects, tier base room, per-room
  £ offsets (base locked to 0), friendly room/rate names, room display
  order (up/down) — saved via the existing PUT endpoint
- enables apples-to-apples estimated benchmark when only e.g. a suite
  is left: bench = room_price - room_offset + bench_offset

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

backend/api/direct.py

@@ -177,6 +177,46 @@ async def delete_hotel(hotel_id: int, user=Depends(get_current_user)):
         await db.commit()
 
 
+@router.get("/hotels/{hotel_id}/config")
+async def hotel_config(hotel_id: int, user=Depends(get_current_user)):
+    """Full config for one hotel plus the room/rate IDs seen in scraped data,
+    for the benchmark / tier-offset / label configuration UI."""
+    require_cap(user, "manage_hotels")
+    async with AsyncSessionLocal() as db:
+        cfg_row = await db.execute(
+            text("""SELECT id, name, profile_name, params, room_labels, rate_labels,
+                           room_order, benchmark_room, benchmark_rate, tier_base_room,
+                           tier_offsets, scrape_enabled
+                    FROM direct_competitor_hotels WHERE id = :id"""),
+            {"id": hotel_id}
+        )
+        hotel = cfg_row.mappings().fetchone()
+        if not hotel:
+            raise HTTPException(status_code=404, detail="Hotel not found")
+
+        ids_result = await db.execute(
+            text("""SELECT DISTINCT room_id, rate_id FROM direct_rates
+                    WHERE hotel_id = :hid"""),
+            {"hid": hotel_id}
+        )
+        pairs = ids_result.fetchall()
+
+    room_ids = sorted({p[0] for p in pairs})
+    rate_ids = sorted({p[1] for p in pairs})
+    # Include any rooms known only from labels/order (e.g. discovery without a scrape yet)
+    for rid in (hotel["room_labels"] or {}):
+        if rid not in room_ids:
+            room_ids.append(rid)
+    for rid in (hotel["rate_labels"] or {}):
+        if rid not in rate_ids:
+            rate_ids.append(rid)
+
+    out = dict(hotel)
+    out["room_ids"] = room_ids
+    out["rate_ids"] = rate_ids
+    return out
+
+
 # ─── Discovery ───────────────────────────────────────────────────────────────
 
 @router.post("/hotels/{hotel_id}/discover")