feat: Add database migrations and auth system

- Add Alembic for database migrations
- Implement user authentication system
- Update frontend styles and components
- Add new test audio functionality
- Update stream management and UI

run_migrations.py

@@ -0,0 +1,29 @@
+#!/usr/bin/env python3
+"""Run database migrations"""
+import os
+import sys
+from alembic.config import Config
+from alembic import command
+from dotenv import load_dotenv
+
+# Load environment variables
+load_dotenv()
+
+def run_migrations():
+    # Get database URL from environment or use default
+    database_url = os.getenv(
+        "DATABASE_URL",
+        "postgresql://postgres:postgres@localhost/dicta2stream"
+    )
+    
+    # Set up Alembic config
+    alembic_cfg = Config()
+    alembic_cfg.set_main_option("script_location", "migrations")
+    alembic_cfg.set_main_option("sqlalchemy.url", database_url)
+    
+    # Run migrations
+    command.upgrade(alembic_cfg, "head")
+    print("Database migrations completed successfully.")
+
+if __name__ == "__main__":
+    run_migrations()