feat: Implement PostgreSQL repositories for various entities

- Added BootstrapInviteRepository for managing bootstrap invites.
- Added ClientRepository for handling OAuth/OpenID clients.
- Introduced LoginAttemptRepository for logging login attempts.
- Created OidcTokenRepository for managing OpenIddict tokens and refresh tokens.
- Implemented RevocationExportStateRepository for persisting revocation export state.
- Added RevocationRepository for managing revocations.
- Introduced ServiceAccountRepository for handling service accounts.

src/AirGap/StellaOps.AirGap.Controller/Endpoints/Contracts/SealRequest.cs

@@ -11,4 +11,10 @@ public sealed class SealRequest
     public TimeAnchor? TimeAnchor { get; set; }
 
     public StalenessBudget? StalenessBudget { get; set; }
+
+    /// <summary>
+    /// Optional per-content staleness budgets (advisories, vex, policy).
+    /// Falls back to StalenessBudget when not provided.
+    /// </summary>
+    public Dictionary<string, StalenessBudget>? ContentBudgets { get; set; }
 }