Initial commit: Pixel AI comic/video creation platform

- FastAPI backend with SQLModel, Alembic migrations, AgentScope agents
- Next.js 15 frontend with React 19, Tailwind, Zustand, React Flow
- Multi-provider AI system (DashScope, Kling, MiniMax, Volcengine, OpenAI, etc.)
- All HTTP clients migrated from sync requests to async httpx
- Admin-managed API keys via environment variables
- SSRF vulnerability fixed in ensure_url()

backend/alembic/versions/rename_style_preset_to_style_id.py

@@ -0,0 +1,34 @@
+"""rename style_preset to style_id
+
+Revision ID: rename_style_preset
+Revises: add_cinematic_fields, add_provider_to_tasks
+Create Date: 2024-02-11
+
+"""
+from alembic import op
+import sqlalchemy as sa
+from typing import Union, Sequence
+
+
+# revision identifiers, used by Alembic.
+revision = 'rename_style_preset'
+down_revision: Union[str, Sequence[str], None] = ('add_cinematic_fields', 'add_provider_to_tasks')
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    """Rename style_preset column to style_id in projects table"""
+    # SQLite doesn't support ALTER COLUMN RENAME directly
+    # We need to use a workaround with table recreation
+    
+    with op.batch_alter_table('projects', schema=None) as batch_op:
+        # Rename the column
+        batch_op.alter_column('style_preset', new_column_name='style_id')
+
+
+def downgrade():
+    """Revert style_id column back to style_preset"""
+    with op.batch_alter_table('projects', schema=None) as batch_op:
+        # Rename back
+        batch_op.alter_column('style_id', new_column_name='style_preset')