feat: Nitro v3 compatibility

[productdevbook]

Summary

• Replace deprecated createError with new HTTPError() across server files
• Update getRouteRules call signature to use (method, path) instead of (event)
• Use event.req.method instead of deprecated getMethod(event)

Fixes #86

Changed Files

• src/runtime/server/middleware/route-access.ts
• src/runtime/server/utils/session.ts
• src/runtime/server/api/_better-auth/sessions.delete.ts

Test plan

• Verify middleware correctly applies route rules
• Verify session utilities throw proper HTTP errors
• Verify session deletion endpoint works correctly

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Project	Deployment	Review	Updated (UTC)
nuxt-better-auth-docs	Error		Jan 27, 2026 6:01am

[productdevbook]

@onmax I just added this. better-auth:client:extend

[onmax]

Hey @productdevbook, nice work on this PR. Just checked, and I like the direction :). could you split out everything not directly tied to Nitro v3 compatibility? I’d keep this PR focused on the nitro/* import changes + getRouteRules/request handling updates.

Move to separate PR:

• better-auth:client:extend feature (hooks types + module hook + defineClientAuth/useUserSession changes)
• .nuxtrc
• auth.config.ts + server/auth.config.ts (if just examples)

If you’d rather, I can extract these into a separate PR.

[productdevbook]

It would be good if you could separate them because I'll be away from nuxt for 2-3 months.