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Move Cloudflare account ID out of .env into wrangler.toml
OpenTofu only auto-maps TF_VAR_*-prefixed env vars, so a plain
CLOUDFLARE_ACCOUNT_ID in .env was never actually consumed - it just
sat there unused while infra/variables.tf's hardcoded default did the
real work. wrangler, unlike Tofu, does read a plain account_id, so
give it its own wrangler.toml and point the deploy app's wrangler
invocation at it with --config.