feat: add secret store foundation

crates/crank-core/src/secret.rs

@@ -0,0 +1,42 @@
+use serde::{Deserialize, Serialize};
+
+use crate::ids::{SecretId, UserId, WorkspaceId};
+
+#[derive(Clone, Copy, Debug, PartialEq, Eq, Serialize, Deserialize)]
+#[serde(rename_all = "snake_case")]
+pub enum SecretKind {
+    Token,
+    UsernamePassword,
+    Header,
+    Generic,
+}
+
+#[derive(Clone, Copy, Debug, PartialEq, Eq, Serialize, Deserialize)]
+#[serde(rename_all = "snake_case")]
+pub enum SecretStatus {
+    Active,
+    Disabled,
+}
+
+#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
+pub struct Secret {
+    pub id: SecretId,
+    pub workspace_id: WorkspaceId,
+    pub name: String,
+    pub kind: SecretKind,
+    pub status: SecretStatus,
+    pub current_version: u32,
+    pub created_at: String,
+    pub updated_at: String,
+    pub last_used_at: Option<String>,
+}
+
+#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
+pub struct SecretVersion {
+    pub secret_id: SecretId,
+    pub version: u32,
+    pub ciphertext: String,
+    pub key_version: String,
+    pub created_at: String,
+    pub created_by: Option<UserId>,
+}