feat: initial monorepo scaffold - Next.js 15 + Prisma + Python SDK stubs

- Turborepo monorepo with apps/web and packages/database, sdk-python
- Next.js 15 app with professional landing page (dark theme, emerald accent)
- Prisma schema: Trace, DecisionPoint, Span, Event models with full indexing
- Docker Compose: web (port 4200), postgres:16, redis:7, migrate service
- Python SDK package stubs: init, trace decorator, log_decision, integrations
- Multi-stage Dockerfile for standalone Next.js production build

packages/sdk-python/README.md

@@ -0,0 +1,38 @@
+# AgentLens Python SDK
+
+AgentLens provides observability for AI agents by tracing decisions, not just API calls.
+
+## Installation
+
+```bash
+pip install agentlens
+```
+
+## Quick Start
+
+```python
+from agentlens import init, trace
+
+# Initialize AgentLens
+init(api_key="your-api-key", endpoint="https://agentlens.vectry.tech")
+
+# Trace your agent functions
+@trace(name="research-agent")
+async def research(topic: str) -> str:
+    return f"Researching: {topic}"
+```
+
+## Features
+
+- **Decision Tracing**: Log and visualize agent decisions with alternatives
+- **Context Awareness**: Monitor context window utilization
+- **Cost Intelligence**: Track token usage and costs per operation
+- **Integrations**: Native support for LangChain and OpenAI
+
+## Documentation
+
+Full documentation available at [https://agentlens.vectry.tech/docs](https://agentlens.vectry.tech/docs)
+
+## License
+
+MIT © 2026 Vectry