[PR] fix(metrics): encode Basic authentication credentials as UTF-8 [rocketmq-dashboard]

["Wang1rrr (via GitHub)" <gi...@apache.org>]

Wang1rrr opened a new pull request, #7011:
URL: https://github.com/apache/rocketmq-dashboard/pull/7011

   ## Summary
   Closes #7010.
   
   Use UTF-8 explicitly for Basic credentials in both the data-source connection probe and the actual Prometheus-compatible range query. The previous Spring default is ISO-8859-1: it silently changes Latin-1 credential bytes and throws for Chinese/emoji credentials. ASCII headers remain byte-for-byte equivalent.
   
   This matches [Prometheus's documented UTF-8 password hashing](https://prometheus.io/docs/guides/basic-auth/#hashing-a-password) and [its authentication handler's comparison of the received password bytes](https://github.com/prometheus/exporter-toolkit/blob/v0.14.1/web/handler.go#L98-L119).
   
   ## Validation
   - Before: all 6 new cases fail, covering accented Latin characters, Chinese, and emoji in both request paths. The range fixture returns HTTP 401 for the wrong Basic header; unencodable credentials fail before sending.
   - After: `mvn -B -ntp -Dtest=PrometheusMetricsSourceTest,SettingsServiceTest test`: 77 tests pass on Java 21; Checkstyle passes.
   - The range-query cases exercise a local HTTP server and the connection-probe cases assert the exact request header. Existing ASCII and Bearer cases also pass.
   - `git diff --check` passes.
   - No external Prometheus deployment or full backend suite was run locally.
   
   AI assistance was used; the diff and before/after regression results were reviewed.
   
   


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