add scrapers: Van Daal (API), Van Silfhout (SSR) for Delft

- fetch_vandaal: OG Online API, covers Delft/Rijswijk/Den Haag area,
  includes is_bought→verkocht status mapping
- fetch_vansilfhout: HTML scraper, all listings on single page,
  extracts postcode from embedded JS variable (objectZipcode)

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

src/adapters/api.py

@@ -244,6 +244,69 @@ def fetch_moerman() -> list[RawListing]:
     return listings
 
 
+# ---------------------------------------------------------------------------
+# Van Daal Makelaardij (Delft)
+# ---------------------------------------------------------------------------
+# OG Online / realtime-listings platform.
+
+_VANDAAL_BASE = "https://www.vandaalmakelaardij.nl"
+_VANDAAL_SKIP = {"rented", "rented_ur"}
+
+_VANDAAL_STATUS_MAP = {
+    "available":    "beschikbaar",
+    "under_bid":    "onder_bod",
+    "under_option": "onder_bod",
+    "is_bought":    "verkocht",
+    "sold":         "verkocht",
+    "sold_ur":      "verkocht",
+}
+
+
+def fetch_vandaal() -> list[RawListing]:
+    data = fetch_json(
+        f"{_VANDAAL_BASE}/nl/realtime-listings/consumer",
+        headers={"X-Requested-With": "XMLHttpRequest"},
+    )
+
+    listings = []
+    for item in data:
+        if not item.get("isSales"):
+            continue
+        if item.get("statusOrig") in _VANDAAL_SKIP:
+            continue
+        if item.get("salesPrice", 0) > config.MAX_PRICE:
+            continue
+
+        postcode = (item.get("zipcode") or "").replace(" ", "") or None
+        perceel = item.get("plotSurface") or None
+        if perceel == 0:
+            perceel = None
+
+        raw_year = item.get("dateOfConstruction") or ""
+        bouwjaar = int(raw_year) if raw_year.isdigit() else None
+
+        listings.append(RawListing(
+            url=_VANDAAL_BASE + item["url"],
+            source_makelaar="vandaal",
+            status=_VANDAAL_STATUS_MAP.get(item.get("statusOrig", ""), "beschikbaar"),
+            adres=item.get("address") or None,
+            postcode=postcode,
+            stad=item.get("city") or None,
+            prijs=item.get("salesPrice") or None,
+            woningtype=item.get("type") or None,
+            woonoppervlak=item.get("livingSurface") or None,
+            perceeloppervlak=perceel,
+            kamers=item.get("rooms") or None,
+            slaapkamers=item.get("bedrooms") or None,
+            bouwjaar=bouwjaar,
+            energielabel=item.get("energyLabel") or None,
+            hero_image_url=item.get("photo") or None,
+        ))
+
+    log.info("vandaal: %d koopwoningen opgehaald", len(listings))
+    return listings
+
+
 # ---------------------------------------------------------------------------
 # SCRAPERS — exporteer hier alle actieve API adapters
 # ---------------------------------------------------------------------------
@@ -252,4 +315,5 @@ SCRAPERS = {
     'bjornd': fetch_bjornd,
     'ooms': fetch_ooms,
     'moerman': fetch_moerman,
+    'vandaal': fetch_vandaal,
 }