fix(cli): ignore string braces when editing targets

[hamedrabah]

Summary

• mask string and comment contents before locating the targets object boundary
• keep newly added targets at the top level when existing config values contain braces
• add a regression test that reloads the edited manifest and verifies the target is enabled

Tests

• pnpm exec vitest run packages/cli/src/commands/ship.test.ts
• pnpm --filter @profullstack/sh1pt typecheck