Refactor blog module and remove blog-related functionality

- Removed blog router and associated API endpoints.
- Deleted blog persistence functions and related query parameters.
- Removed blog schemas and models from the codebase.
- Introduced common crate for shared types, including DateTimeWithTimeZoneWrapper.
- Added Thought and Follow models with corresponding migrations.
- Updated dependencies in Cargo.toml files to reflect changes.
- Adjusted tests to remove references to the blog module.

thoughts-backend/app/src/persistence/blog.rs

@@ -1,24 +0,0 @@
-use sea_orm::{ActiveModelTrait, ColumnTrait, DbConn, DbErr, EntityTrait, QueryFilter, Set};
-
-use models::{domains::blog, params::blog::CreateBlogParams, queries::blog::BlogQuery};
-
-pub async fn search_blogs(db: &DbConn, query: BlogQuery) -> Result<Vec<blog::Model>, DbErr> {
-    blog::Entity::find()
-        .filter(blog::Column::Title.contains(query.title.unwrap_or_default()))
-        .all(db)
-        .await
-}
-
-pub async fn create_blog(
-    db: &DbConn,
-    params: CreateBlogParams,
-) -> Result<blog::ActiveModel, DbErr> {
-    blog::ActiveModel {
-        author_id: Set(params.author_id as i32),
-        title: Set(params.title),
-        content: Set(params.content),
-        ..Default::default()
-    }
-    .save(db)
-    .await
-}

thoughts-backend/app/src/persistence/mod.rs

@@ -1,2 +1 @@
-pub mod blog;
 pub mod user;