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/models/src/domains/prelude.rs

@@ -1,4 +1,5 @@
 //! `SeaORM` Entity, @generated by sea-orm-codegen 1.0.0
 
-pub use super::blog::Entity as Blog;
+pub use super::follow::Entity as Follow;
+pub use super::thought::Entity as Thought;
 pub use super::user::Entity as User;