feat: LLM routing by tier (free→Ollama, pro→Timeweb)

- Add tier-based provider routing in llm-svc
  - free tier → Ollama (local qwen3.5:9b)
  - pro/business → Timeweb Cloud AI
- Add /api/v1/embed endpoint for embeddings via Ollama
- Update Ollama client: qwen3.5:9b default, remove auth
- Add GenerateEmbedding() function for qwen3-embedding:0.6b
- Add Ollama K8s deployment with GPU support (RTX 4060 Ti)
- Add monitoring stack (Prometheus, Grafana, Alertmanager)
- Add Grafana dashboards for LLM and security metrics
- Update deploy.sh with monitoring and Ollama deployment

Made-with: Cursor

backend/deploy/k8s/api-gateway.yaml

@@ -16,6 +16,10 @@ spec:
     metadata:
       labels:
         app: api-gateway
+      annotations:
+        prometheus.io/scrape: "true"
+        prometheus.io/port: "3015"
+        prometheus.io/path: "/metrics"
     spec:
       containers:
       - name: api-gateway