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/add_progress_tracking.py

@@ -0,0 +1,30 @@
+"""add progress tracking fields
+
+Revision ID: add_progress_tracking
+Revises: add_task_mgmt_fields
+Create Date: 2026-01-16 15:00:00.000000
+
+"""
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy.dialects import sqlite
+
+# revision identifiers, used by Alembic.
+revision = 'add_progress_tracking'
+down_revision = 'add_task_mgmt_fields'
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    # Add progress and error columns to projects table
+    with op.batch_alter_table('projects', schema=None) as batch_op:
+        batch_op.add_column(sa.Column('progress', sa.JSON(), nullable=True))
+        batch_op.add_column(sa.Column('error', sa.JSON(), nullable=True))
+
+
+def downgrade() -> None:
+    # Remove progress and error columns from projects table
+    with op.batch_alter_table('projects', schema=None) as batch_op:
+        batch_op.drop_column('error')
+        batch_op.drop_column('progress')