Design and implement Todo data model with SQLite schema

[landoyjx]

Create the Todo data model and corresponding SQLite schema. Fields: id (string/UUID primary key), title (string, non-empty), completed (boolean, default false), createdAt (datetime), updatedAt (datetime). Set up the database connection and a migration/script that creates the todos table on startup.

Acceptance Criteria:

• SQLite table todos exists with correct columns and types
• id is generated automatically on insert
• createdAt and updatedAt are populated automatically

Test Cases:

• Unit: Insert a valid Todo and verify all fields are persisted correctly
• Unit: Verify default value of completed is false when omitted
• Edge: Attempting to insert a Todo with a null title raises a validation/database error