[BUG] Boolean tars parameter parsed via Byte.valueOf → NumberFormatException

- severity: Medium
- files: `shenyu-plugin/shenyu-plugin-proxy/shenyu-plugin-rpc/shenyu-plugin-tars/src/main/java/org/apache/shenyu/plugin/tars/util/PrxInfoUtil.java:67-72`
- description: The `boolean` PrimitiveType converter does `if (o instanceof String) { return Byte.valueOf((String) o); }`. For a boolean supplied as `"true"`/`"false"`, `Byte.valueOf("true")` throws `NumberFormatException`. Copy-paste from the `byte` converter (line 61-66); should be `Boolean.valueOf`/`Boolean.parseBoolean`.
- impact: Any tars method with a `boolean` parameter whose value arrives as a string fails with 500.
- suggested_fix: Replace `Byte.valueOf((String) o)` with `Boolean.valueOf((String) o)`.
- confidence: High
- related_existing: none

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_Identified during the 2026-08-02 deep re-scan; full list in [`docs/scan2-2026-08-02/06-medium-tiers.md`](docs/scan2-2026-08-02/06-medium-tiers.md)._

Start in shenyu-plugin/shenyu-plugin-proxy/shenyu-plugin-rpc/shenyu-plugin-tars/src/main/java/org/apache/shenyu/plugin/tars/util/PrxInfoUtil.java at lines 67-72, and compare the boolean converter with the byte converter at lines 61-66. Verify that string values "true" and "false" are handled without NumberFormatException; the issue is done when boolean TARS parameters supplied as strings no longer produce a 500.

Written by the indexing model from the issue text.