feat: Day 11 - landing page polish, SDK README, PyPI publish as vectry-agentlens

- Landing page: pip install snippet, How it Works section, dual code examples (decorator + OpenAI wrapper), Integrations section, Open Source badge
- SDK README: quickstart, OpenAI/LangChain/Custom integrations, API reference, architecture diagram
- Published vectry-agentlens v0.1.0 to PyPI (import as agentlens)
- Fixed pyproject.toml: hatchling.build backend, wheel package mapping

packages/sdk-python/pyproject.toml

@@ -1,9 +1,9 @@
 [build-system]
 requires = ["hatchling"]
-build-backend = "hatchling.backends"
+build-backend = "hatchling.build"
 
 [project]
-name = "agentlens"
+name = "vectry-agentlens"
 version = "0.1.0"
 description = "Agent observability that traces decisions, not just API calls"
 readme = "README.md"
@@ -25,7 +25,10 @@ dependencies = [
 [project.optional-dependencies]
 langchain = ["langchain-core>=0.1.0"]
 openai = ["openai>=1.0.0"]
-all = ["agentlens[langchain,openai]"]
+all = ["vectry-agentlens[langchain,openai]"]
+
+[tool.hatch.build.targets.wheel]
+packages = ["agentlens"]
 
 [project.urls]
 Homepage = "https://agentlens.vectry.tech"