feat: @convex-dev/better-auth 0.10 compatibility

[zbeyens]

Summary

• Update to @convex-dev/better-auth@0.10.4 and better-auth@1.4.7
• Change createApi signature to accept createAuth function instead of spread options
• Change authClient.adapter to accept createAuthOptions function
• Add getLatestJwks and rotateKeys exports for static JWKS management
• Add CreateAuth type export
• Rename files to kebab-case convention

Breaking Changes

See changeset for full migration guide.

Link to upstream migration: https://labs.convex.dev/better-auth/migrations/migrate-to-0-10

Test plan

• Verify TypeScript types compile correctly
• Test getLatestJwks generates JWKS
• Test rotateKeys rotates keys
• Verify migration steps work on existing project

🤖 Generated with Claude Code

[changeset-bot]

🦋 Changeset detected

Latest commit: cc1ca02

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
better-auth-convex	Minor

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