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

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

@@ -3,6 +3,8 @@ use utoipa::ToSchema;
 use uuid::Uuid;
 use validator::Validate;
 
+use crate::domains::thought::Visibility;
+
 #[derive(Deserialize, Validate, ToSchema)]
 pub struct CreateThoughtParams {
     #[validate(length(
@@ -11,6 +13,6 @@ pub struct CreateThoughtParams {
         message = "Content must be between 1 and 128 characters"
     ))]
     pub content: String,
-
+    pub visibility: Option<Visibility>,
     pub reply_to_id: Option<Uuid>,
 }