Phase 0 WP-0.10–0.12: Host skeleton, options classes, sample configs, and execution framework

- WP-0.10: Role-based Host startup (Central=WebApplication, Site=generic Host),
  15 component AddXxx() extension methods, MapCentralUI/MapInboundAPI stubs
- WP-0.11: 12 per-component options classes with config binding
- WP-0.12: Sample appsettings for central and site topologies
- Add execution procedure and checklist template to generate_plans.md
- Add phase-0-checklist.md for execution tracking
- Resolve all 21 open questions from plan generation
- Update IDataConnection with batch ops and IAsyncDisposable
57 tests pass, zero warnings.

src/ScadaLink.Security/SecurityOptions.cs

@@ -0,0 +1,11 @@
+namespace ScadaLink.Security;
+
+public class SecurityOptions
+{
+    public string LdapServer { get; set; } = string.Empty;
+    public int LdapPort { get; set; } = 389;
+    public bool LdapUseTls { get; set; } = true;
+    public string JwtSigningKey { get; set; } = string.Empty;
+    public int JwtExpiryMinutes { get; set; } = 15;
+    public int IdleTimeoutMinutes { get; set; } = 30;
+}