feat: Add Oghma RAG Proxy for SkyrimNet lore injection

RAG proxy that intercepts SkyrimNet LLM requests and enriches them
with relevant Tamrielic lore from CHIM's Oghma Infinium database.

Features:
- FastAPI proxy compatible with OpenAI API
- ChromaDB semantic search for lore retrieval
- NPC profile extraction from SkyrimNet prompts
- Google Sheets ingestion for CHIM's Oghma data
- Kubernetes deployment manifests
- Debug endpoint for RAG operation monitoring

Collections ingested to iris-dev ChromaDB:
- oghma_lore: 1951 entries (scholar knowledge)
- oghma_basic: 1949 entries (commoner knowledge)
- oghma_visual: 1151 entries (Omnisight perception)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

oghma-proxy/k8s/secret.yaml

@@ -0,0 +1,33 @@
+apiVersion: v1
+kind: Secret
+metadata:
+  name: oghma-proxy-secrets
+  namespace: nimmersky
+  labels:
+    app.kubernetes.io/name: oghma-proxy
+    app.kubernetes.io/part-of: nimmerverse
+type: Opaque
+stringData:
+  # Replace with actual values or use external secret management
+  OPENROUTER_API_KEY: "your-openrouter-api-key-here"
+  UPSTREAM_URL: "https://openrouter.ai/api/v1"
+
+---
+# Alternative: Use ExternalSecret with Vault/Vaultwarden
+# apiVersion: external-secrets.io/v1beta1
+# kind: ExternalSecret
+# metadata:
+#   name: oghma-proxy-secrets
+#   namespace: nimmersky
+# spec:
+#   refreshInterval: 1h
+#   secretStoreRef:
+#     name: vault-backend
+#     kind: ClusterSecretStore
+#   target:
+#     name: oghma-proxy-secrets
+#   data:
+#     - secretKey: OPENROUTER_API_KEY
+#       remoteRef:
+#         key: nimmerverse/skyrimnet
+#         property: openrouter_api_key