CAMEL-23674: camel-jbang - Register ExportTypeConverter for Duration and Short types

[davsclaus]

Summary

Fixes CAMEL-23674: The export silent run fails on non-stubbed components (like timer) when property placeholders resolve to @@CamelMagicValue@@ and the target type is java.time.Duration.

Root Cause

The ExportTypeConverter already handles Duration conversion, but it was only registered as a fallback converter. The built-in DurationConverter (a direct @Converter) runs first and throws NumberFormatException when trying to parse @@CamelMagicValue@@, preventing the fallback from ever being tried.

Fix

Register the ExportTypeConverter explicitly for Duration.class (and Short.class which was also missing) so it takes priority over the built-in converters during export, matching the existing pattern for Integer, Long, Double, Float, Byte, and Boolean.

Test Plan

• ExportTest.shouldGenerateJavaContent — previously failing on all 3 runtime variants (Quarkus, Spring Boot, Camel Main), now passes
• Full reactor build passes

Claude Code on behalf of Claus Ibsen

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🧪 CI tested the following changed modules:

• dsl/camel-kamelet-main

All tested modules (6 modules)

• Camel :: JBang :: MCP
• Camel :: JBang :: Plugin :: Route Parser
• Camel :: JBang :: Plugin :: TUI
• Camel :: JBang :: Plugin :: Validate
• Camel :: Kamelet Main
• Camel :: Launcher :: Container

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