[PR] test(ai): pin the thinking source wire names and strict decode [rocketmq-dashboard]

["zjncs (via GitHub)" <gi...@apache.org>]

zjncs opened a new pull request, #5713:
URL: https://github.com/apache/rocketmq-dashboard/pull/5713

   ### What
   
   `ThinkingSource` — the single field that keeps model reasoning apart from the prompt-enhancement rewrite — had no test. This adds `ThinkingSourceTest` with 6 tests.
   
   ### Why
   
   The enum's javadoc names the bug it exists to prevent: without a source, the UI coalesced both thinking streams into one block under a chain-of-thought heading — i.e. a prompt rewrite was presented to the user as model reasoning. The strict decode is the other half of that defense: an unknown wire name means the two sides drifted, and silently falling back to MODEL would reintroduce the bug.
   
   ### What is pinned
   
   - both wire names, `model` and `enhance`, lowercase;
   - both decode through `fromWireName`;
   - **an unknown wire name is rejected loudly** (`IllegalArgumentException`), never silently mapped;
   - the match is **case-sensitive**: `Model` and `ENHANCE` are drifts, not synonyms;
   - Jackson serialises the lowercase wire name in both directions (`@JsonValue`/`@JsonCreator`) and rejects an unknown one.
   
   ### Verification
   
   - New tests on unmodified code: **6/6 green** (`mvn test -Dtest=ThinkingSourceTest`).
   - Discriminating mutations on `ThinkingSource`, build result verified red each time:
     1. the `model` wire name changed to `reasoning` — red;
     2. the strict decode replaced by a silent MODEL fallback — red;
     3. the match made case-insensitive — red.
   - Restored: 6/6 green. Test-only change; no product code touched.
   


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