Add registratie wizard, BFF dashboard-view, contracts/value-objects, and architecture docs

Checkpoint of in-progress work: the registration wizard (address prefill,
DUO diploma lookup, policy questions), decision-DTO contracts, parse-don't-
validate value objects, infrastructure adapters, plus CLAUDE.md and the
architecture/ADR docs.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

public/mock/duo-diplomas.json

@@ -0,0 +1,38 @@
+{
+  "diplomas": [
+    {
+      "id": "d1",
+      "naam": "Geneeskunde",
+      "instelling": "Universiteit Leiden",
+      "jaar": 2011,
+      "beroep": "Arts",
+      "policyQuestions": []
+    },
+    {
+      "id": "d2",
+      "naam": "Medicine (MBChB)",
+      "instelling": "University of Edinburgh",
+      "jaar": 2013,
+      "beroep": "Arts",
+      "policyQuestions": [
+        { "id": "nl-taalvaardigheid", "vraag": "Uw opleiding was Engelstalig. Beheerst u de Nederlandse taal op het vereiste niveau (B2)?", "type": "ja-nee" }
+      ]
+    },
+    {
+      "id": "d3",
+      "naam": "HBO-Verpleegkunde",
+      "instelling": "Hogeschool Utrecht",
+      "jaar": 2016,
+      "beroep": "Verpleegkundige",
+      "policyQuestions": []
+    }
+  ],
+  "handmatig": {
+    "beroepen": ["Arts", "Verpleegkundige", "Fysiotherapeut", "Apotheker", "Tandarts"],
+    "policyQuestions": [
+      { "id": "nl-taalvaardigheid", "vraag": "Beheerst u de Nederlandse taal op het vereiste niveau (B2)?", "type": "ja-nee" },
+      { "id": "diploma-erkend", "vraag": "Is uw diploma erkend door de Nederlandse overheid (bijv. via Nuffic)?", "type": "ja-nee" },
+      { "id": "toelichting", "vraag": "Geef een korte toelichting op uw diploma en opleiding.", "type": "tekst" }
+    ]
+  }
+}