feat: Initialize Zastava Webhook service with TLS and Authority authentication

- Added Program.cs to set up the web application with Serilog for logging, health check endpoints, and a placeholder admission endpoint.
- Configured Kestrel server to use TLS 1.3 and handle client certificates appropriately.
- Created StellaOps.Zastava.Webhook.csproj with necessary dependencies including Serilog and Polly.
- Documented tasks in TASKS.md for the Zastava Webhook project, outlining current work and exit criteria for each task.

src/StellaOps.Scheduler.Storage.Mongo/Options/SchedulerMongoOptions.cs

@@ -0,0 +1,34 @@
+using System;
+
+namespace StellaOps.Scheduler.Storage.Mongo.Options;
+
+/// <summary>
+/// Configures MongoDB connectivity and collection names for Scheduler storage.
+/// </summary>
+public sealed class SchedulerMongoOptions
+{
+    public string ConnectionString { get; set; } = "mongodb://localhost:27017";
+
+    public string Database { get; set; } = "stellaops_scheduler";
+
+    public string SchedulesCollection { get; set; } = "schedules";
+
+    public string RunsCollection { get; set; } = "runs";
+
+    public string ImpactSnapshotsCollection { get; set; } = "impact_snapshots";
+
+    public string AuditCollection { get; set; } = "audit";
+
+    public string LocksCollection { get; set; } = "locks";
+
+    public string MigrationsCollection { get; set; } = "_scheduler_migrations";
+
+    /// <summary>
+    /// Optional TTL applied to completed runs. When zero or negative no TTL index is created.
+    /// </summary>
+    public TimeSpan CompletedRunRetention { get; set; } = TimeSpan.FromDays(180);
+
+    public bool UseMajorityReadConcern { get; set; } = true;
+
+    public bool UseMajorityWriteConcern { get; set; } = true;
+}