chore: update dependencies and fix security vulnerabilities (#51)

- Ran npm install to sync node_modules with package.json declarations
  (better-auth was missing, next/zod/dotenv/openai were at old major versions)
- Ran npm audit fix to resolve 3 vulnerabilities:
  - rollup 4.0.0-4.58.0 (High): CVE-2026-27606 Arbitrary File Write via Path Traversal
  - minimatch (High): GHSA-3ppc-4f35-3m26 ReDoS via repeated wildcards
  - ajv <6.14.0 (Moderate): GHSA-2g4f-4pwh-qvx6 ReDoS with $data option
- Ran npm update to apply all safe patch/minor updates within semver ranges
- eslint v10 intentionally deferred pending breaking change evaluation

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: chriskehayias

next-env.d.ts

@@ -1,6 +1,6 @@
 /// <reference types="next" />
 /// <reference types="next/image-types/global" />
-import "./.next/dev/types/routes.d.ts";
+import "./.next/types/routes.d.ts";
 
 // NOTE: This file should not be edited
 // see https://nextjs.org/docs/app/api-reference/config/typescript for more information.