feat: initial project setup with implementation plan

- Add PLAN.md with 40-step checklist across 10 phases
- Add CLAUDE.md with project-specific instructions
- Set up nix flake with FastHTML/MonsterUI dependencies
- Create Python package skeleton (src/animaltrack)
- Vendor FastHTML and MonsterUI documentation
- Add Docker build configuration

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

packages/monsterui.nix

@@ -0,0 +1,38 @@
+{
+  lib,
+  buildPythonPackage,
+  fetchPypi,
+  setuptools,
+  python-fasthtml,
+  fastcore,
+  lxml,
+  mistletoe,
+}:
+
+buildPythonPackage rec {
+  pname = "monsterui";
+  version = "1.0.34";
+  pyproject = true;
+
+  src = fetchPypi {
+    inherit pname version;
+    hash = "sha256:03krc10adsx6xf09lxw8gs8lq7jja8yyhw5hjrgss24fgal6163b";
+  };
+
+  build-system = [ setuptools ];
+
+  dependencies = [
+    python-fasthtml
+    fastcore
+    lxml
+    mistletoe
+  ];
+
+  doCheck = false;
+
+  meta = {
+    description = "Beautiful UI components for FastHTML";
+    homepage = "https://github.com/AnswerDotAI/MonsterUI";
+    license = lib.licenses.asl20;
+  };
+}