feat: implement user profile management with avatars, login, and personal data

- Add avatar upload functionality with public URL access.
- Implement user login with email and password authentication.
- Create endpoints for fetching and updating the authenticated user's profile.
- Set up database migrations for user profiles, including email and role management.
- Introduce personal data management linked to user profiles.
- Add email verification process with welcome email templates.

profiles/migrations/5_add_email.up.sql

@@ -0,0 +1,7 @@
+ALTER TABLE user_profiles ADD COLUMN email TEXT NOT NULL DEFAULT '';
+
+-- Existing rows predate the email column; give each a unique placeholder
+-- derived from its user ID so the uniqueness constraint below can apply.
+UPDATE user_profiles SET email = user_id || '@example.invalid' WHERE email = '';
+
+CREATE UNIQUE INDEX user_profiles_email_idx ON user_profiles (email);