fix(archreview): security authz+hub cluster (SEC-07/05/08/11) + validation hardening

SEC-07: add QueryActiveAlarmsRequest -> events:read scope arm; fix two tests that
  constructed StreamAlarmsRequest instead of QueryActiveAlarmsRequest.
SEC-05: shorten hub-token lifetime 30m -> 5m; document that the ?access_token= query
  carriage must never be request-logged.
SEC-08: gateway-side CachingApiKeyVerifier (short TTL, keyed on a hash of the presented
  secret) skips the per-call store read+last_used write; CoalescingMarkApiKeyStore bounds
  last_used writes to <=1/key/min; identity constraints are cached. Invalidation is wired
  at the gateway admin sites (revoke/rotate/delete); short TTL backstops out-of-process CLI.
SEC-11: fixed-window rate limit on POST /auth/login + a per-peer (key-id) failure limiter
  checked before VerifyAsync; new MxGateway:Security options bound + validated.

Also fixes regressions from the SEC-01/04/06 commit (c185f62) that a narrow test filter
missed (all now covered by a full-suite checkpoint):
- Rooting check is cross-platform: accepts Windows C:\/UNC forms on Unix so the shipped
  appsettings path validates on the macOS dev box, still rejecting bare filenames.
- AddGatewayConfiguration TryAdds a non-production IHostEnvironment fallback so the validator
  resolves in minimal test/tooling containers; the real host + apikey CLI register the actual
  environment first (TryAdd no-op there).
- Test assembly defaults ASPNETCORE_ENVIRONMENT=Development (ModuleInitializer) so full-host
  tests exercise wiring instead of tripping the SEC-04/06 production guards.
- GatewayOptionsTests asserts the SEC-01 CommonApplicationData-derived default (platform-correct).

archreview: SEC-07/05/08/11 (P1). Verified: NonWindows build clean; full gateway suite
747 passed / 42 failed, where all 42 are the pre-existing macOS named-pipe-harness failures
(Unix-socket path limit) and 0 are validation/regression failures.

src/ZB.MOM.WW.MxGateway.Tests/Gateway/Dashboard/DashboardLoginRateLimitTests.cs

@@ -0,0 +1,66 @@
+using System.Net;
+using System.Threading.RateLimiting;
+using Microsoft.AspNetCore.Http;
+using ZB.MOM.WW.MxGateway.Server.Configuration;
+using ZB.MOM.WW.MxGateway.Server.Dashboard;
+
+namespace ZB.MOM.WW.MxGateway.Tests.Gateway.Dashboard;
+
+/// <summary>
+/// SEC-11: the <c>POST /auth/login</c> fixed-window per-IP rate limiter. Exercised through the same
+/// partition factory the production policy registers, so the test pins the real permit limit and
+/// per-IP partitioning without standing up an HTTP server.
+/// </summary>
+public sealed class DashboardLoginRateLimitTests
+{
+    /// <summary>A burst beyond the permit limit from one IP has its excess attempts rejected (HTTP 429 in the pipeline).</summary>
+    [Fact]
+    public void LoginRateLimiter_BurstBeyondPermitLimit_RejectsExcessFromSameIp()
+    {
+        SecurityOptions security = new()
+        {
+            LoginRateLimitPermitLimit = 3,
+            LoginRateLimitWindowSeconds = 60,
+        };
+        using PartitionedRateLimiter<HttpContext> limiter =
+            DashboardEndpointRouteBuilderExtensions.CreateLoginRateLimiter(security);
+        HttpContext context = ContextWithIp("10.0.0.7");
+
+        for (int i = 0; i < 3; i++)
+        {
+            using RateLimitLease lease = limiter.AttemptAcquire(context);
+            Assert.True(lease.IsAcquired);
+        }
+
+        using RateLimitLease rejected = limiter.AttemptAcquire(context);
+        Assert.False(rejected.IsAcquired);
+    }
+
+    /// <summary>Distinct client IPs are partitioned independently — one IP's burst does not starve another.</summary>
+    [Fact]
+    public void LoginRateLimiter_DistinctIps_PartitionedIndependently()
+    {
+        SecurityOptions security = new()
+        {
+            LoginRateLimitPermitLimit = 1,
+            LoginRateLimitWindowSeconds = 60,
+        };
+        using PartitionedRateLimiter<HttpContext> limiter =
+            DashboardEndpointRouteBuilderExtensions.CreateLoginRateLimiter(security);
+
+        using RateLimitLease first = limiter.AttemptAcquire(ContextWithIp("10.0.0.1"));
+        using RateLimitLease exhaustedForFirst = limiter.AttemptAcquire(ContextWithIp("10.0.0.1"));
+        using RateLimitLease second = limiter.AttemptAcquire(ContextWithIp("10.0.0.2"));
+
+        Assert.True(first.IsAcquired);
+        Assert.False(exhaustedForFirst.IsAcquired);
+        Assert.True(second.IsAcquired);
+    }
+
+    private static HttpContext ContextWithIp(string ip)
+    {
+        DefaultHttpContext context = new();
+        context.Connection.RemoteIpAddress = IPAddress.Parse(ip);
+        return context;
+    }
+}