ci: fix model names to match SAP AI Core deployments

- Restore sonnet reviewer with correct model name (anthropic--claude-4.6-sonnet)
- Remove gpt-4.1, gpt-4.1-mini, gpt-5-mini (not deployed on SAP AI Core)
- Keep gpt-5 and security reviewers

The previous model names (claude-sonnet-4-6, etc.) were incorrect —
SAP AI Core uses 'anthropic--claude-4.6-sonnet' format.

.gitea/workflows/ci.yml

@@ -19,8 +19,7 @@ jobs:
       - run: go build -o review-bot ./cmd/review-bot
 
   # Self-review: builds from source since we're pre-release
-  # Note: claude-sonnet-4-6, gpt-4.1, gpt-4.1-mini, gpt-5-mini removed —
+  # Models configured to match SAP AI Core deployments
-  #       not deployed on LLM proxy. Only gpt-5 is available.
   review:
     runs-on: ubuntu-24.04
     if: github.event_name == 'pull_request'
@@ -28,6 +27,11 @@ jobs:
     strategy:
       matrix:
         include:
+          - name: sonnet
+            token_secret: SONNET_REVIEW_TOKEN
+            provider: anthropic
+            llm_path: /anthropic/v1
+            model: anthropic--claude-4.6-sonnet
           - name: gpt
             token_secret: GPT_REVIEW_TOKEN
             provider: openai