feat: Refactor user and thought models to use UUIDs instead of integers

- Updated user and thought models to utilize UUIDs for primary keys.
- Modified persistence functions to accommodate UUIDs for user and thought IDs.
- Implemented tag functionality with new Tag and ThoughtTag models.
- Added migration scripts to create new tables for tags and thought-tag relationships.
- Enhanced thought creation to parse hashtags and link them to thoughts.
- Updated tests to reflect changes in user and thought ID types.

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

@@ -3,10 +3,10 @@ use sea_orm::entity::prelude::*;
 #[derive(Clone, Debug, PartialEq, DeriveEntityModel, Eq)]
 #[sea_orm(table_name = "follow")]
 pub struct Model {
-    #[sea_orm(primary_key)]
-    pub follower_id: i32,
-    #[sea_orm(primary_key)]
-    pub followed_id: i32,
+    #[sea_orm(primary_key, auto_increment = false)]
+    pub follower_id: Uuid,
+    #[sea_orm(primary_key, auto_increment = false)]
+    pub followed_id: Uuid,
 }
 
 #[derive(Copy, Clone, Debug, EnumIter, DeriveRelation)]
@@ -29,4 +29,10 @@ pub enum Relation {
     Followed,
 }
 
+impl Related<super::user::Entity> for Entity {
+    fn to() -> RelationDef {
+        Relation::Follower.def()
+    }
+}
+
 impl ActiveModelBehavior for ActiveModel {}