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/params/thought.rs

@@ -0,0 +1,11 @@
+use serde::Deserialize;
+use utoipa::ToSchema;
+use validator::Validate;
+
+#[derive(Deserialize, Validate, ToSchema)]
+pub struct CreateThoughtParams {
+    pub author_id: i32,
+
+    #[validate(length(min = 1, max = 128))]
+    pub content: String,
+}