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

migrations/add_processed_filename_to_uploadlog.py

@@ -0,0 +1,24 @@
+"""Add processed_filename to UploadLog
+
+Revision ID: add_processed_filename_to_uploadlog
+Revises: 
+Create Date: 2025-06-28 13:20:00.000000
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+# revision identifiers, used by Alembic.
+revision = 'add_processed_filename_to_uploadlog'
+down_revision = None
+branch_labels = None
+depends_on = None
+
+def upgrade():
+    # Add the processed_filename column to the uploadlog table
+    op.add_column('uploadlog', 
+                 sa.Column('processed_filename', sa.String(), nullable=True))
+
+def downgrade():
+    # Remove the processed_filename column if rolling back
+    op.drop_column('uploadlog', 'processed_filename')