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.Scanner.Analyzers.Lang.Python/Placeholder.cs

@@ -0,0 +1,6 @@
+namespace StellaOps.Scanner.Analyzers.Lang.Python;
+
+internal static class Placeholder
+{
+    // Analyzer implementation will be added during Sprint LA2.
+}