Fix Vercel build: generate .env asset at build time from environment variable

[Copilot]

pubspec.yaml declares .env as a Flutter asset, but the file is gitignored, causing flutter build web to fail with No file or variants found for asset: .env.

Changes

• vercel.json — Adds explicit Vercel build configuration:

  • buildCommand validates GROQ_APIKEY is set, writes it to .env, then runs flutter build web --release
  • outputDirectory set to build/web
  • installCommand matches the Flutter install logic previously configured only in Vercel's UI

  "buildCommand": "[ -n \"${GROQ_APIKEY}\" ] || { echo \"Error: GROQ_APIKEY environment variable is not set\"; exit 1; } && echo \"GROQ_APIKEY=${GROQ_APIKEY}\" > .env && flutter/bin/flutter build web --release"

• .env.example — Documents required env vars for local development (cp .env.example .env)

• .gitignore — Adds !.env.example exception so the template is tracked while real .env files stay ignored

Setup required: Add GROQ_APIKEY to Vercel project environment variables.

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