Extract config structs into pkg/probodconfig

probod-bootstrap only needs the config struct definitions for
YAML marshaling but transitively pulled in ~40 heavy runtime
dependencies via pkg/probod. Move all config types and their
methods to a new pkg/probodconfig package and re-export them
from pkg/probod via type aliases for backward compatibility.

Signed-off-by: Émile Ré <emile@getprobo.com>

pkg/probodconfig/saml_config.go

@@ -0,0 +1,47 @@
+// Copyright (c) 2026 Probo Inc <hello@getprobo.com>.
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+// AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
+// OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+// PERFORMANCE OF THIS SOFTWARE.
+
+package probodconfig
+
+import (
+	"time"
+)
+
+type SAMLConfig struct {
+	SessionDuration                   int    `json:"session-duration"`
+	CleanupIntervalSeconds            int    `json:"cleanup-interval-seconds"`
+	Certificate                       string `json:"certificate"`
+	PrivateKey                        string `json:"private-key"`
+	DomainVerificationIntervalSeconds int    `json:"domain-verification-interval-seconds"`
+	DomainVerificationResolverAddr    string `json:"domain-verification-resolver-addr"`
+}
+
+func (c SAMLConfig) SessionDurationTime() time.Duration {
+	if c.SessionDuration == 0 {
+		return 7 * 24 * time.Hour
+	}
+	return time.Duration(c.SessionDuration) * time.Second
+}
+
+func (c SAMLConfig) CleanupInterval() time.Duration {
+	if c.CleanupIntervalSeconds == 0 {
+		return 0
+	}
+
+	return time.Duration(c.CleanupIntervalSeconds) * time.Second
+}
+
+func (c SAMLConfig) DomainVerificationInterval() time.Duration {
+	return time.Duration(c.DomainVerificationIntervalSeconds) * time.Second
+}