chore(config): remove unused @/* path alias from tsconfig

[urjitc]

This is a Tracer end-to-end test drill and not a response to a real incident.

What changed

Removed the unused "@/*": ["./src/*"] path alias from tsconfig.json. The entire codebase already imports via "#/*", so "@/*" is dead configuration.

Why

• Simplifies paths to a single, actively used alias (#/*).
• Eliminates a misleading, unused entry that could cause confusion or tooling drift.
• Zero behavioral change.

Verification

• Confirmed no source file imports via "@/ (grep across src).
• npx vitest run --config vitest.config.ts → 10 test files, 31 tests passed.
• npx tsc --noEmit --pretty → clean compile with no errors.

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