docs: Java/Kotlin SDK v2.7.0 release updates

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Summary

Updates documentation for Java/Kotlin SDK v2.7.0 release.

Changes

• TerminalException metadata: Document the new metadata parameter on TerminalException that allows attaching structured key-value context to terminal errors. The metadata is propagated to callers via getMetadata(). Requires Restate Server >= 1.6.
• Spring Boot global default configuration: Document the new top-level restate.* properties that act as defaults for all registered services. Per-service restate.components.<Name>.* properties override these defaults on a per-service basis.
• Code snippets: Updated Java and Kotlin ErrorHandling snippet files with #metadata and #catch_metadata tagged sections.
• Restate plugin skills: Updated the Java API reference in the coding agent skills with TerminalException metadata documentation.

Note: ctx.random() now returns a stable instance (behavior fix, not a new API). Users upgrading should redeploy as a new service version per the versioning guide — no doc changes needed as the API surface is unchanged.

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