fix: disallow crawling of /dashboard/* and /auth/callback

[rafaio1]

Summary

Added disallow rules to src/app/robots.ts to prevent search engines from indexing the /dashboard/* demo data pages and the /auth/callback route.

Changes

• Updated src/app/robots.ts to include disallow entries for /dashboard/* and /auth/callback.
• This prevents crawlers from indexing mock financial data and the OAuth callback page.

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