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/schemas/thought.rs

@@ -0,0 +1,36 @@
+use crate::domains::thought;
+use common::DateTimeWithTimeZoneWrapper;
+use serde::Serialize;
+use utoipa::ToSchema;
+
+#[derive(Serialize, ToSchema)]
+pub struct ThoughtSchema {
+    pub id: i32,
+    pub author_id: i32,
+    pub content: String,
+    pub created_at: DateTimeWithTimeZoneWrapper,
+}
+
+impl From<thought::Model> for ThoughtSchema {
+    fn from(model: thought::Model) -> Self {
+        Self {
+            id: model.id,
+            author_id: model.author_id,
+            content: model.content,
+            created_at: model.created_at.into(),
+        }
+    }
+}
+
+#[derive(Serialize, ToSchema)]
+pub struct ThoughtListSchema {
+    pub thoughts: Vec<ThoughtSchema>,
+}
+
+impl From<Vec<thought::Model>> for ThoughtListSchema {
+    fn from(models: Vec<thought::Model>) -> Self {
+        Self {
+            thoughts: models.into_iter().map(ThoughtSchema::from).collect(),
+        }
+    }
+}