Serve compliance pages via domain routing

Rename the compliancepage HTTP package to complianceportal and drop the
slug-based id middleware. Compliance pages are now served exclusively
over SNI-based custom-domain HTTPS, with the SNI middleware resolving the
page by TLS server name and redirecting secondary domains to the
canonical host.

Signed-off-by: Bryan Frimin <bryan@probo.com>

pkg/server/api/complianceportal/context.go

@@ -0,0 +1,44 @@
+// Copyright (c) 2026 Probo Inc <hello@probo.com>.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+package complianceportal
+
+import (
+	"context"
+
+	"go.probo.inc/probo/pkg/coredata"
+)
+
+type ctxKey struct{ name string }
+
+var (
+	compliancePageKey        = &ctxKey{name: "compliance_page"}
+	compliancePageBaseURLKey = &ctxKey{name: "compliance_page_base_url"}
+)
+
+func CompliancePageFromContext(ctx context.Context) *coredata.TrustCenter {
+	page, _ := ctx.Value(compliancePageKey).(*coredata.TrustCenter)
+	return page
+}
+
+func CompliancePageBaseURLFromContext(ctx context.Context) *string {
+	page, _ := ctx.Value(compliancePageBaseURLKey).(*string)
+	return page
+}