fix(llm): make API URL configurable for Kubernetes internal service

Issue: Orchestrator pods failing with 'api.riotpiao.com is unreachable'
- URL was hardcoded to external hostname
- Inside Kubernetes cluster, needs to use internal service DNS

Changes:
- Make LocalLLMBaseURL read from LOCAL_LLM_BASE_URL env var
- Default to 'https://api.riotpiao.com' for external deployments
- Update orchestrator-job.yaml to pass internal service: http://api-gateway.api:8080
- Update worker-deployment.yaml to use same internal service URL

This allows pods to reach the LLM API via Kubernetes DNS without external network access.

k8s/orchestrator-job.yaml

@@ -52,6 +52,8 @@ spec:
             secretKeyRef:
               name: poimen-secrets
               key: ANTHROPIC_API_KEY
+        - name: LOCAL_LLM_BASE_URL
+          value: "http://api-gateway.api:8080"
         resources:
           requests:
             memory: "512Mi"