chore: create devcontainer setup

.devcontainer/Dockerfile

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+# Dev container Dockerfile
+FROM mcr.microsoft.com/devcontainers/python:3.12-bullseye
+
+# Install Poetry
+RUN curl -sSL https://install.python-poetry.org | python3 -
+
+# Install Poetry Plugins
+RUN poetry self add poetry-dotenv-plugin || true && poetry self add poetry-bumpversion || true

.devcontainer/devcontainer.json

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+{
+  "name": "Langfuse Python SDK",
+  "build": {
+    "dockerfile": "Dockerfile"
+  },
+  "postCreateCommand": "bash .devcontainer/post-create.sh"
+}

.devcontainer/post-create.sh

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+#!/bin/bash
+
+set -e
+
+echo "🚀 Setting up Langfuse Python SDK development environment..."
+
+# Install project dependencies including all extras
+echo "📚 Installing project dependencies..."
+poetry install --all-extras
+
+# Setup pre-commit hooks
+echo "🪝 Setting up pre-commit hooks..."
+poetry run pre-commit install
+
+# Create a basic .env file if it doesn't exist
+if [ ! -f .env ]; then
+    echo "📝 Creating .env file from template..."
+    cp .env.template .env
+fi
+
+echo "✅ Development environment setup complete!"
+echo ""
+echo "🎯 Quick start commands:"
+echo "  poetry run pytest -s -v --log-cli-level=INFO    # Run tests"
+echo "  poetry run ruff format .                        # Format code"
+echo "  poetry run ruff check .                         # Lint code"
+echo "  poetry run mypy .                               # Type check"
+echo "  poetry run pre-commit run --all-files           # Run pre-commit"
+echo ""