feat(behandel): behandel-portal app — medewerker login + werkbak with decide (refs #13)

Scaffold apps/behandel (mirrors self-service): medewerker-realm OIDC login, the werkbak page

listing registrations awaiting beoordeling (GET /behandel/werkbak) with goedkeuren/afwijzen

actions (POST /behandel/registrations/{id}/decide) that refresh the list, plus Dockerfile and

same-origin nginx reverse proxy for /behandel/ (ADR-0013; S-12).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

apps/behandel/tsconfig.spec.json

@@ -0,0 +1,8 @@
+{
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "outDir": "../../dist/out-tsc",
+    "types": ["vitest/globals"]
+  },
+  "include": ["src/**/*.ts", "src/**/*.d.ts"]
+}