Add admin panel, WebSocket support, and API versioning

Introduce an admin portal (React + Nginx), WebSocket routing, and
API versioning middleware with `/api/v1/` prefix deprecation.
Add master API key authentication, new Prometheus metrics for AI
token consumption and active WebSockets, and extend S3 config
with a public endpoint URL. Update test paths and fixtures to
align with the new routing structure.

sdk/pyproject.toml

@@ -0,0 +1,31 @@
+[build-system]
+requires = ["hatchling"]
+build-backend = "hatchling.build"
+
+[project]
+name = "imago-client"
+version = "0.1.0"
+description = "Official Python SDK for the Imago API"
+readme = "README.md"
+authors = [
+    { name = "Imago Project" }
+]
+requires-python = ">=3.10"
+dependencies = [
+    "httpx>=0.23.0",
+    "websockets>=13.0",
+]
+
+[project.optional-dependencies]
+dev = [
+    "pytest>=7.0.0",
+    "pytest-asyncio>=0.21.0",
+    "respx>=0.20.0",
+]
+
+[tool.hatch.build.targets.wheel]
+packages = ["imago_client"]
+
+[tool.pytest.ini_options]
+asyncio_mode = "auto"
+testpaths = ["tests"]