fix: change model, add CLAUDE file

CLAUDE.md

@@ -0,0 +1,20 @@
+# Caltrack
+
+## WHAT
+- This is a calorie counter web application, written in Go
+- It has a Terminal-like UI
+
+## WHY
+- The idea of the app is to have a very simple, straight forward UI
+- It should reduce looking up nutrition facts
+- It should pre-calculate the activity level kcal and how much to consume to loose x amount of weight per week
+
+## HOW
+- It is a web app/API written in Go
+- It starts a http file server to serve the web/index.html file
+- It is deployed on my own OVH VPS, behind a Caddy server which redirects calls to /caltrack/*
+- It is served as a web frontend
+- It has a API handlers to create and delete entries
+- The API also provides handlers to get data for any given day
+- It can store settings, like your weight, height, gender
+- It uses Claude AI API calls to read human text and converts it into an API call to get nutrition facts out

ai/ai.go

@@ -66,7 +66,7 @@ func (c *Client) EstimateCalories(ctx context.Context, description string, entry
 	prompt := fmt.Sprintf("Estimate calories for this %s: %s", entryType, description)
 
 	msg, err := client.Messages.New(ctx, anthropic.MessageNewParams{
-		Model:     "claude-haiku-4-5-20251001",
+		Model:     "claude-sonnet-4-6",
 		MaxTokens: 1024,
 		System: []anthropic.TextBlockParam{
 			{Text: systemPrompt},