feat: add DeepSeek and NVIDIA NIM providers

- Add deepseek and nvidia entries to gateway-provider config

- Add DEEPSEEK_API_KEY and NVIDIA_API_KEY to .env.example

- Add deepseek and nvidia to doctor's LLM provider check

- Fix remaining harness-log → log-message reference

.gitea/workflows/deploy.yml

@@ -19,6 +19,6 @@ jobs:
       - name: Build and deploy via Docker Compose
         run: |
           cd infrastructure/docker
-          docker-compose -p opencortex down
-          docker-compose -p opencortex build --no-cache opencortex
-          docker-compose -p opencortex up -d --force-recreate opencortex
+          docker-compose -p passepartout down
+          docker-compose -p passepartout build --no-cache passepartout
+          docker-compose -p passepartout up -d --force-recreate passepartout