Use direct OpenAI defaults for matchmaking

.env.example

@@ -14,6 +14,12 @@ REDIS_URL=redis://localhost:6379/0
 # Inputs / engine (wired in later slices)
 APIFY_TOKEN=
 OPENAI_API_KEY=
+OPENAI_API_BASE=
+DSPY_API_BASE=
+DSPY_API_KEY=
+CURATE_MODEL=gpt-4o-mini
+SUGGEST_MODEL=gpt-4o-mini
+EMBED_MODEL=text-embedding-3-small
 
 # QScore (consumed)
 QSCORE_BASE_URL=http://localhost:8004