Support Inertia v3 protocol metadata

[DominusKelvin]

Summary

Closes #192

This starts the stable Inertia v3 support work for inertia-sails and the Boring Stack templates.

What Changed

• Updated all template root views to use the Inertia v3 JSON script boot payload.
• Added asset-version mismatch handling for GET Inertia requests using 409 Conflict and X-Inertia-Location.
• Changed Inertia JSON responses to use Vary: X-Inertia.
• Omitted false clearHistory and encryptHistory flags from page objects.
• Added sharedProps metadata.
• Added v3 merge metadata support: mergeProps, prependProps, deepMergeProps, and matchPropsOn.
• Added nested append/prepend merge targets and item matching.
• Added InfiniteScroll merge intent support with X-Inertia-Infinite-Scroll-Merge-Intent.
• Added focused Node test coverage for page objects, render behavior, merge props, and scroll props.

Validation

• npm test in packages/inertia-sails passes: 20/20.
• Relevant docs work is split into the companion docs.sailscasts.com PR.

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	@​inertiajs/​svelte@​2.0.17 ⏵ 3.1.1	+4		+4	+2
	@​inertiajs/​react@​2.2.15 ⏵ 3.1.1				+1
	@​inertiajs/​vue3@​2.0.17 ⏵ 3.1.1			+3	+2
	axios@​1.13.2 ⏵ 1.16.1	-11	+50
	inertia-sails@​1.0.1 ⏵ 1.4.0

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