Import upstream v0.16.24, stripped

Upstream commit: af37a234981722493b74623a983581691d2b70b6
Enterprise-only files removed or emptied: 63
Enterprise-only snippets removed: 118 in 50 files
Dangling module declarations removed: 5
Edits turning enterprise off: 25
Third-party code: 14 files, 0 not in THIRD-PARTY.md
Renamed identifiers: 62 in 18 files
Verification: clean

The same Enterprise footprint as v0.16.23. The build check fails only on
tests/src/directory/issuer.rs, unchanged since v0.16.23: it calls a helper
from upstream's Enterprise-only OIDC test, and tests issuer-based directory
routing, an Enterprise feature. main has never carried it.

crates/registry/src/schema/structs.rs

@@ -1457,6 +1457,7 @@ pub enum DnsServer {
     Vultr(DnsServerCloud),
     WebSupport(DnsServerWebSupport),
     YandexCloud(DnsServerYandexCloud),
+    PowerDns(DnsServerPowerDns),
 }
 
 #[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
@@ -1672,6 +1673,7 @@ pub enum DnsServerBootstrap {
     Vultr(DnsServerCloud),
     WebSupport(DnsServerWebSupport),
     YandexCloud(DnsServerYandexCloud),
+    PowerDns(DnsServerPowerDns),
 }
 
 #[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
@@ -2435,6 +2437,31 @@ pub struct DnsServerPorkbun {
     pub propagation_delay: Option<Duration>,
 }
 
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
+#[serde(default)]
+pub struct DnsServerPowerDns {
+    #[serde(rename = "apiKey")]
+    pub api_key: SecretKey,
+    #[serde(rename = "endpoint")]
+    pub endpoint: Option<String>,
+    #[serde(rename = "serverId")]
+    pub server_id: Option<String>,
+    #[serde(rename = "description")]
+    pub description: String,
+    #[serde(rename = "memberTenantId")]
+    pub member_tenant_id: Option<Id>,
+    #[serde(rename = "timeout")]
+    pub timeout: Duration,
+    #[serde(rename = "ttl")]
+    pub ttl: Duration,
+    #[serde(rename = "pollingInterval")]
+    pub polling_interval: Duration,
+    #[serde(rename = "propagationTimeout")]
+    pub propagation_timeout: Duration,
+    #[serde(rename = "propagationDelay")]
+    pub propagation_delay: Option<Duration>,
+}
+
 #[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
 #[serde(default)]
 pub struct DnsServerRoute53 {