fix: blank external URLs in base values, set only in stage overrides

Base values.yaml now has empty OLLAMA_BASE_URL, MARKET_DATA_BASE_URL,
and BROKER_PROVIDER. Only paper (and eventually live) set the real
URLs. Beta inherits empty defaults so it can't reach external services.

infra/helm/stonks-oracle/values-beta.yaml

@@ -54,7 +54,6 @@ config:
   MINIO_ENDPOINT: "minio.minio-service.svc.cluster.local:80"
   MINIO_SECURE: "false"
   BROKER_MODE: "paper"
-  BROKER_PROVIDER: "none"
 
 ## Blank out all secrets so beta never talks to external APIs
 secrets:

infra/helm/stonks-oracle/values-paper.yaml

@@ -17,6 +17,7 @@ config:
   DEPLOY_STAGE: "paper"
   POSTGRES_USER: "stonks_paper"
   OLLAMA_BASE_URL: "http://10.1.1.12:2701"
+  MARKET_DATA_BASE_URL: "https://api.polygon.io"
 
 ## Secrets — all credentials for the paper stage
 ## These are rendered into K8s Secrets by the Helm chart.

infra/helm/stonks-oracle/values.yaml

@@ -161,7 +161,7 @@ config:
   REDIS_DB: "0"
   MINIO_ENDPOINT: "minio.minio-service.svc.cluster.local:80"
   MINIO_SECURE: "false"
-  OLLAMA_BASE_URL: "http://10.1.1.12:2701"
+  OLLAMA_BASE_URL: ""
   OLLAMA_MODEL: "qwen3.5:9b-fast"
   OLLAMA_TIMEOUT: "240"
   OLLAMA_MAX_RETRIES: "2"
@@ -174,8 +174,8 @@ config:
   TRINO_SCHEMA: "stonks"
   TRINO_ICEBERG_CATALOG: "iceberg"
   BROKER_MODE: "paper"
-  BROKER_PROVIDER: "alpaca"
+  BROKER_PROVIDER: ""
-  MARKET_DATA_BASE_URL: "https://api.polygon.io"
+  MARKET_DATA_BASE_URL: ""
   MARKET_DATA_PROVIDER: "polygon"
   RETENTION_RAW_MARKET_DAYS: "90"
   RETENTION_RAW_NEWS_DAYS: "180"
@@ -213,7 +213,7 @@ secrets:
   broker:
     BROKER_API_KEY: ""
     BROKER_API_SECRET: ""
-    BROKER_BASE_URL: "https://paper-api.alpaca.markets"
+    BROKER_BASE_URL: ""
   market:
     MARKET_DATA_API_KEY: ""
   gmail: