fix(frontend): gate recharge actions by payment availability

[mlhiter]

Summary

• Gate insufficient-balance recharge actions in App Launchpad and Database on CostCenter payment availability.
• Add provider-local, fail-closed payment configuration endpoints with trusted runtime URL fallbacks.
• Remove the duplicate deployment error toast from the Database edit flow.

Sequence Diagram

sequenceDiagram
    participant User
    participant Provider
    participant CostCenter
    participant Desktop
    User->>Provider: Deployment fails with insufficient balance
    Provider->>CostCenter: Read payment configuration
    alt Recharge enabled and payment method available
        CostCenter-->>Provider: paymentEnabled = true
        Provider-->>User: Show Add credit action
        User->>Provider: Select Add credit
        Provider->>Desktop: Open CostCenter recharge
    else Disabled or unavailable
        CostCenter-->>Provider: Disabled or request failure
        Provider-->>User: Show confirmation-only dialog
    end

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Verification

• App Launchpad and Database lint passed.
• App Launchpad and Database typechecks passed.
• App Launchpad and Database production builds passed.
• Enabled, disabled, and unavailable CostCenter API smoke cases passed; unavailable configuration fails closed.
• git diff --check passed.
• Vitest is unavailable in this checkout (vitest command not found).