Simplify: use vllm-api-key for WEBUI_SECRET_KEY

ExternalSecret only provides vllm-api-key from 1Password.
Using same key for both purposes is acceptable for now.
Avoids need for manual secret patching.

cluster/applications/open-webui/deployment.yaml

@@ -37,7 +37,7 @@ spec:
           valueFrom:
             secretKeyRef:
               name: body-wars-secret
-              key: webui-secret-key
+              key: vllm-api-key
               optional: false
         # Backend configuration for vLLM (OpenAI-compatible, NOT Ollama)
         # OLLAMA_BASE_URLS removed: astro-orbiter runs vLLM, not Ollama