ci: fix reviewer models — sonnet uses Anthropic, gpt uses GPT-5

The matrix was wrong: "sonnet" was running GPT-5 and "gpt" was running
GPT-4.1. Now:
- sonnet → Claude Sonnet 4.6 via HAI Anthropic endpoint
- gpt → GPT-5 via HAI OpenAI endpoint
- security → GPT-5 via HAI OpenAI endpoint

Each matrix entry specifies its own provider and base_url.

.gitea/workflows/ci.yml

@@ -28,12 +28,18 @@ jobs:
         include:
           - name: sonnet
             token_secret: SONNET_REVIEW_TOKEN
-            model: gpt-5
+            provider: anthropic
+            base_url: http://100.86.77.84:6655/anthropic/v1
+            model: claude-sonnet-4-6
           - name: gpt
             token_secret: GPT_REVIEW_TOKEN
-            model: gpt-4.1
+            provider: openai
+            base_url: http://100.86.77.84:6655/openai/v1
+            model: gpt-5
           - name: security
             token_secret: SECURITY_REVIEW_TOKEN
+            provider: openai
+            base_url: http://100.86.77.84:6655/openai/v1
             model: gpt-5
             system_prompt_file: SECURITY_REVIEW.md
     steps:
@@ -49,9 +55,10 @@ jobs:
           PR_NUMBER: ${{ github.event.pull_request.number }}
           REVIEWER_TOKEN: ${{ secrets[matrix.token_secret] }}
           REVIEWER_NAME: ${{ matrix.name }}
-          LLM_BASE_URL: ${{ secrets.LLM_BASE_URL }}
+          LLM_BASE_URL: ${{ matrix.base_url }}
           LLM_API_KEY: ${{ secrets.LLM_API_KEY }}
           LLM_MODEL: ${{ matrix.model }}
+          LLM_PROVIDER: ${{ matrix.provider }}
           CONVENTIONS_FILE: "CONVENTIONS.md"
           PATTERNS_REPO: "rodin/go-patterns"
           PATTERNS_FILES: "README.md,patterns/"