fix(host,security): wire static assets, DI lifetimes, form login, dev-stub LDAP

Six interlocking fixes surfaced while smoke-testing the fused Host in a browser:

- Host/Program.cs: UseStaticWebAssets() opts into the RCL static-asset pipeline
  in any environment (auto-only in Development), MapStaticAssets().AllowAnonymous()
  exempts CSS/JS from the AddOtOpcUaAuth fallback policy, and
  AddCascadingAuthenticationState() lets <AuthorizeView/> work inside interactive
  components (NavSidebar's session block).
- Security/ServiceCollectionExtensions: ILdapAuthService Scoped → Singleton —
  consumed by the Singleton LdapOpcUaUserAuthenticator on driver-role nodes.
  Crash only surfaced in Development (ValidateOnBuild=true).
- Security/Endpoints/AuthEndpoints: /auth/login now dispatches on Content-Type —
  application/json keeps the original 204/401/503 contract for tests, and
  application/x-www-form-urlencoded (the browser <form>) gets a redirect dance.
  DisableAntiforgery on the login endpoint (it's the entry point, no prior session)
  and AllowAnonymous to override the fallback policy.
- Security/Ldap/LdapOptions + LdapAuthService: real DevStubMode property; when
  true the auth service bypasses the LDAP bind and returns a FleetAdmin role so
  dev/test can navigate the full Admin UI without GLAuth running.
- AdminUI/EndpointRouteBuilderExtensions: doc-comment update about static-asset
  flow (the actual MapStaticAssets call lives in Host/Program.cs).

src/Server/ZB.MOM.WW.OtOpcUa.Security/Ldap/LdapAuthService.cs

@@ -22,6 +22,12 @@ public sealed class LdapAuthService(IOptions<LdapOptions> options, ILogger<LdapA
         if (string.IsNullOrWhiteSpace(password))
             return new(false, null, null, [], [], "Password is required");
 
+        if (_options.DevStubMode)
+        {
+            logger.LogWarning("LdapAuthService: DevStubMode bypass — accepting {User} without a real LDAP bind", username);
+            return new(true, username, username, ["dev"], ["FleetAdmin"], null);
+        }
+
         if (!_options.UseTls && !_options.AllowInsecureLdap)
             return new(false, null, username, [], [],
                 "Insecure LDAP is disabled. Enable UseTls or set AllowInsecureLdap for dev/test.");