feat: add scrapers for vandriel, vanherk, vanoord

- vandriel (Schiedam): OG Online API, filtered by city=schiedam
- vanherk (Schiedam): SURE WordPress plugin (card-house), detail page kenmerken
- vanoord (Delft + Schiedam): Elementor WordPress, two filtered listing URLs, rw-object-features-list detail parsing
- makelaars.md: mark all three as done, add TODO for API scraper detail page enrichment

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

makelaars.md

@@ -1,5 +1,9 @@
 # Verkoopmakelaars Delft, Leiden, Den Haag & Schiedam
 
+## TODO
+
+- **API scrapers need detail page enrichment**: OG Online API (bjornd, moerman, vandaal, elzenaar, doen, vandriel) sometimes omits fields like `energyLabel`. We should fetch the detail page for each listing and merge in missing fields (especially energielabel, bouwjaar). This is already done for SSR scrapers; needs to be added to API-based ones.
+
 ## Delft
 
 | Done | Naam | Website | Adres |
@@ -23,6 +27,7 @@
 | [ ] | Bergklis Makelaars | bergklis.nl | — |
 | [ ] | Van Gulden Makelaardij | vanguldenmakelaardij.nl | Zaïrestraat 1 |
 | [ ] | Van der Togt Makelaardij | vdtmakelaardij.nl | — (Voorburg, actief in Delft) |
+| [x] | Van Oord Makelaardij | vanoordmakelaardij.nl | — (Delft + Schiedam) |
 
 
 ## Schiedam
@@ -40,6 +45,8 @@
 | [x] | Moerman & De Jong Makelaars | moerman-dejong.nl | Lange Kerkstraat 80B |
 | [ ] | Hagestein Makelaardij | — | Degerfors 54 |
 | [x] | Schieland Borsboom NVM Makelaars | schielandborsboom.nl | (Rotterdam, actief in Schiedam) |
+| [x] | Vandriel Makelaardij | vandrielmakelaardij.nl | — |
+| [x] | Van Herk Makelaars | vanherk.nl | — |
 
 
 ## Den Haag