fix(installer): valida formato da DB URL antes de usar nas migrations

[felipetruman]

Problema

No provision, dbUrl é construída por buildPoolerDbUrl/buildDirectDbUrl mas o formato final nunca é validado (só logado com hasDbUrl: !!dbUrl). Se os componentes vierem vazios/malformados (projectRef ou dbPass ausentes), a URL fica inválida e só quebra mais tarde, dentro das migrations, com erro obscuro difícil de diagnosticar no wizard.

Correção

Fail-fast logo após a resolução: se dbUrl está setada mas não casa com postgres://user:pass@host/db, aborta com mensagem clara apontando projectRef/dbPass.

• URL vazia continua permitida (caminho "sem dbPass + pooler indisponível → migrations puladas", já tratado acima).
• Sem mudança de schema, sem migration.

Test plan

• Provision com dbPass válido → passa, migrations rodam.
• Forçar dbUrl malformada → aborta no Step 5 com mensagem clara (antes era erro genérico nas migrations).

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Run ID: 72b5972f-7e05-483e-929f-a50ca208e23f

📥 Commits

Reviewing files that changed from the base of the PR and between 17c69e2 and 1633e73.

📒 Files selected for processing (1)

• app/api/installer/provision/route.ts

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