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

alembic/versions/f86c93c7a872_add_processed_filename_to_uploadlog.py

@@ -0,0 +1,30 @@
+"""add_processed_filename_to_uploadlog
+
+Revision ID: f86c93c7a872
+Revises: 1ab2db0e4b5e
+Create Date: 2025-06-28 15:56:29.169668
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision: str = 'f86c93c7a872'
+down_revision: Union[str, Sequence[str], None] = '1ab2db0e4b5e'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    """Upgrade schema."""
+    op.add_column('uploadlog', 
+                 sa.Column('processed_filename', sa.String(), nullable=True),
+                 schema=None)
+
+
+def downgrade() -> None:
+    """Downgrade schema."""
+    op.drop_column('uploadlog', 'processed_filename', schema=None)