feat: add visibility feature to thoughts, including new enum, database migration, and update related endpoints and tests

thoughts-backend/models/src/domains/thought.rs

@@ -1,4 +1,19 @@
 use sea_orm::entity::prelude::*;
+use serde::{Deserialize, Serialize};
+use utoipa::ToSchema;
+
+#[derive(
+    Debug, Clone, PartialEq, Eq, EnumIter, DeriveActiveEnum, Serialize, Deserialize, ToSchema,
+)]
+#[sea_orm(rs_type = "String", db_type = "Enum", enum_name = "thought_visibility")]
+pub enum Visibility {
+    #[sea_orm(string_value = "public")]
+    Public,
+    #[sea_orm(string_value = "friends_only")]
+    FriendsOnly,
+    #[sea_orm(string_value = "private")]
+    Private,
+}
 
 #[derive(Clone, Debug, PartialEq, DeriveEntityModel, Eq)]
 #[sea_orm(table_name = "thought")]
@@ -8,6 +23,7 @@ pub struct Model {
     pub author_id: Uuid,
     pub content: String,
     pub reply_to_id: Option<Uuid>,
+    pub visibility: Visibility,
     pub created_at: DateTimeWithTimeZone,
 }