feat: complete release readiness work

- consolidate API ownership and remove dead vendor code

- add Stripe billing, learning paths, and public CV hardening

- add migration, recovery, security, audit, and browser gates

JobTrackerApi/Models/UserRuleSettings.cs

@@ -0,0 +1,19 @@
+namespace JobTrackerApi.Models;
+
+public sealed class UserRuleSettings
+{
+    public string OwnerUserId { get; set; } = "";
+
+    // Applied / no response yet
+    public int AppliedFollowUpDays { get; set; } = 14;
+    public int AppliedGhostDays { get; set; } = 30;
+
+    // Offer / accepted waiting on next step
+    public int OfferFollowUpDays { get; set; } = 7;
+    public int OfferGhostDays { get; set; } = 14;
+
+    // Rejected but you requested feedback
+    public int FeedbackFollowUpDays { get; set; } = 7;
+    public int FeedbackGhostDays { get; set; } = 14;
+}
+