Function applyLocalCaInstallTrust

applyLocalCaInstallTrust(
config: Record<string, unknown>,
installTrust: boolean,
): void
Set apps.pki.certificate_authorities.local.install_trust. Idempotent. Mutates in place. Throws when an intermediate node exists but isn't an object — silent retyping would corrupt unrelated state.

Motivating case: on Windows the local CA's first issuance triggers UAC + certutil (5–30 s), blocking the admin API.
Parameters
- config: Record<string, unknown>
- installTrust: boolean
Returns void
Example
```
applyLocalCaInstallTrust(cfg, false) // skip trust install
```
- Defined in src/caddy/tls.ts:548