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/queries/blog.rs

@@ -1,9 +0,0 @@
-use serde::Deserialize;
-use utoipa::IntoParams;
-
-#[derive(Deserialize, Default, IntoParams)]
-#[into_params(style = Form, parameter_in = Query)]
-pub struct BlogQuery {
-    #[param(nullable = true)]
-    pub title: Option<String>,
-}

thoughts-backend/models/src/queries/mod.rs

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