feat: self-hosted LLM backend — point all workflows at the Jetson (Ollama, model=coder)

The Jetson Orin Nano (JetPack 7.2, Ollama on GPU) is live, so ci-ai runs fully
self-hosted: no Anthropic key, no cloud, no per-PR cost. AI_PROVIDER=ollama,
AI_BASE_URL=http://192.168.178.103:11434/v1. The Pi runner reaches it LAN-direct
(SNAT to .48, allowed by the Jetson UFW). Removed the dead ANTHROPIC_API_KEY
secret declarations.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

workflows/ci-failure.example.yml

@@ -26,9 +26,9 @@
 #         run: apt-get update -qq && apt-get install -y -qq --no-install-recommends git ca-certificates
 #       - name: KI-Analyse
 #         env:
-#           AI_PROVIDER: anthropic
-#           AI_MODEL: claude-3-5-haiku-latest
-#           ANTHROPIC_API_KEY: ${{ secrets.ANTHROPIC_API_KEY }}
+#           AI_PROVIDER: ollama
+#           AI_MODEL: coder
+#           AI_BASE_URL: http://192.168.178.103:11434/v1
 #           GITEA_TOKEN: ${{ github.token }}
 #           GITEA_API: https://git.eulernest.eu/api/v1
 #         run: |