add prod web deployment

shell.nix

@@ -7,6 +7,7 @@ pkgs.mkShell {
       beautifulsoup4
       flask
       lxml
+      waitress
     ]))
     pkgs.claude-code
   ];

src/web.py

@@ -8,6 +8,7 @@ import os
 from flask import Flask, render_template, g
 
 DB_PATH = os.environ.get("DB_PATH", "/data/huizenbot.db")
+APP_ENV = os.environ.get("APP_ENV", "dev")
 
 app = Flask(__name__)
 
@@ -57,4 +58,8 @@ def index():
 
 
 if __name__ == "__main__":
-    app.run(debug=True, host="0.0.0.0", port=5000)
+    if APP_ENV == "dev":
+        app.run(debug=True, host="0.0.0.0", port=5000)
+    else:
+        from waitress import serve
+        serve(app, host="0.0.0.0", port=5000)