Migration restaurant-comparison-tool to Tinyfish SDK

[KrishnaAgarwal7531]

Removes the last Vite artefact from the App Router migration. src/App.tsx was a near-identical duplicate of src/app/page.tsx left over from the Vite entry point — nothing imported it, now it's gone.
Also fixes the README setup flow: setup step now points to .env.example with a cp command instead of instructing users to hand-author a .env.local, and the sign-up link corrected from agent.tinyfish.ai to tinyfish.ai to match .env.example. README fully rewritten to match the current codebase.

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[simantak-dabhade]

Clean migration — SDK idiomatic, no Mino, build passes, Vite leftovers removed, README references .env.example. Old #139 issues all addressed.

Two fixes needed:

1. Remove GROQ_API_KEY from .env.example

Lines 5-7 list GROQ_API_KEY but there are zero Groq references anywhere in src/. The app only needs TINYFISH_API_KEY. Having a dead key misleads users into signing up for Groq they don't need.

2. README sign-up URL

Line 96 shows https://tinyfish.ai — should be https://agent.tinyfish.ai/api-keys to match .env.example and the canonical URL.

Nits (non-blocking):

• eslint.config.js still imports eslint-plugin-react-refresh (Vite leftover) — npm run lint would fail
• next-env.d.ts is committed — normally .gitignored