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()

.gitignore

@@ -0,0 +1,41 @@
+# Python
+__pycache__/
+*.pyc
+.venv/
+*.egg-info/
+.pytest_cache/
+
+# Database
+*.db
+*.sqlite
+*.sqlite3
+
+# Node
+node_modules/
+.next/
+tsconfig.tsbuildinfo
+
+# Environment & Secrets
+.env
+.env.local
+.env.*.local
+backend/src/config/storage.json
+
+# IDE
+.vscode/
+.idea/
+
+# OS
+.DS_Store
+
+# Logs
+logs/
+*.log
+
+# Build
+dist/
+build/
+
+# Claude Code
+.omc/
+.claude/