<feature>[guesttools]: support runtime params for script execution

[zstack-robot-2]

1. Add runtimeParams field to APIExecuteGuestVmScriptMsg for dynamic parameter passing
2. Add mergeRenderParams() method to merge script default params with runtime params
3. Add validation for runtimeParams JSON format in GuestToolsApiInterceptor
4. Add validation to ensure all script placeholders have corresponding params
5. Store merged params in execution record for traceability
6. Add unit tests for runtime params functionality

Resolves: ZSTAC-79185

Change-Id: I7377637968707664656b74727665746a6f7a6a65

sync from gitlab !8958

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch sync/lin.ma/ZSTAC-79185@@2

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