test(schema): probeListenPort range fixtures (positive + negative cases)

test/schema/invalid/probelistenport-negative.expect.txt

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+at '/probeListenPort'

test/schema/invalid/probelistenport-negative.yaml

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+probeListenPort: -1

test/schema/invalid/probelistenport-too-high.expect.txt

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+at '/probeListenPort'

test/schema/invalid/probelistenport-too-high.yaml

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+probeListenPort: 70000

test/schema/valid/probelistenport-explicit.yaml

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+# Locks down the [0, 65535] range on probeListenPort. 0 = disabled
+# (default); any 1..65535 enables a separate plain-HTTP probe server.
+probeListenPort: 8081