Add initial project files

Co-Authored-By: Claude Sonnet 4.6 <[email protected]>

.env.example

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+# MySQL
+MYSQL_ROOT_PASSWORD=changeme_root
+MYSQL_DATABASE=bourbonacci
+MYSQL_USER=bourbonacci
+MYSQL_PASSWORD=changeme_db
+
+# Backend
+DATABASE_URL=mysql+aiomysql://bourbonacci:changeme_db@db:3306/bourbonacci
+SECRET_KEY=changeme_generate_a_long_random_string_here
+ACCESS_TOKEN_EXPIRE_MINUTES=480