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>

docs/vendor/monsterui/api_ref/docs_loading.md

@@ -0,0 +1,61 @@
+# Loading Indicators API Reference
+
+See Source
+
+See Output
+
+[code]
+
+    def ex_loading1():
+        return Loading()
+    
+[/code]
+
+See Source
+
+See Output
+
+[code]
+
+    def ex_loading2():
+        types = [LoadingT.spinner, LoadingT.dots, LoadingT.ring, LoadingT.ball, LoadingT.bars, LoadingT.infinity]
+        sizes = [LoadingT.xs, LoadingT.sm, LoadingT.md, LoadingT.lg]
+        rows = [Div(*[Loading((t,s)) for s in sizes], cls='flex gap-4') for t in types]
+        return Div(*rows, cls='flex flex-col gap-4')
+    
+[/code]
+
+### Loading
+
+Source
+
+[code]
+
+    Loading(cls=(<LoadingT.bars: 'loading-bars'>, <LoadingT.lg: 'loading-large'>), htmx_indicator=False, **kwargs) -> fastcore.xml.FT
+[/code]
+
+> Creates a loading animation component
+
+**Params**
+
+  * `cls` Classes for indicator (generally `LoadingT` options)
+
+  * `htmx_indicator` Add htmx-indicator class
+
+  * `kwargs`
+
+**Returns:** Span(cls=...)
+
+* * *
+
+### LoadingT
+
+__
+
+Option | Value | Option | Value | Option | Value  
+---|---|---|---|---|---  
+spinner | loading-spinner | dots | loading-dots | ring | loading-ring  
+ball | loading-ball | bars | loading-bars | infinity | loading-infinity  
+xs | loading-xsmall | sm | loading-small | md | loading-medium  
+lg | loading-large |  |  |  | 
+