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/Cargo.toml

@@ -16,12 +16,13 @@ members = ["api", "app", "doc", "models", "migration", "utils"]
 [workspace.dependencies]
 axum = { version = "0.8.4", default-features = false }
 tower = { version = "0.5.2", default-features = false }
-sea-orm = { version = "1.1.12", default-features = false }
+sea-orm = { version = "1.1.12" }
 serde = { version = "1.0.219", features = ["derive"] }
-serde_json = { version = "1.0.140", default-features = false }
+serde_json = { version = "1.0.140" }
 tracing = "0.1.41"
-utoipa = { version = "5.4.0", default-features = false, features = ["macros"] }
+utoipa = { version = "5.4.0", features = ["macros", "chrono"] }
 validator = { version = "0.20.0", default-features = false }
+chrono = { version = "0.4.41", features = ["serde"] }
 
 [dependencies]
 api = { path = "api" }