Security: Remove hardcoded API key and add environment variable handling

.env.template

@@ -0,0 +1,2 @@
+# Anthropic Key
+ANTHROPIC_KEY=your_anthropic_key_here 

src/streamlit_app.py

@@ -39,7 +39,10 @@ AGE_CONTEXT = {
 
 # Handle API key setup
 try:
-    api_key = "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"
+    api_key = os.getenv("ANTHROPIC_KEY")
+    if not api_key:
+        st.error("Anthropic API key not found. Please set the ANTHROPIC_KEY environment variable.")
+        st.stop()
     c = Anthropic(api_key=api_key)
 except Exception as e:
     st.error(f"Error initializing Anthropic client: {str(e)}")