Remove unused templates for newsletter creation, settings, and submissions; update unsubscribe confirmation link; add tests for email templates API.

server/routes/static.py

@@ -0,0 +1,27 @@
+from __future__ import annotations
+
+from flask import Blueprint, render_template, send_from_directory
+import os
+
+bp = Blueprint("static", __name__)
+
+
+@bp.route("/static/css/styles.css", methods=["GET"])
+def serve_css():
+    """Serve the unified CSS file."""
+    static_dir = os.path.join(os.path.dirname(__file__), '..', '..', 'static')
+    return send_from_directory(static_dir, 'css/styles.css')
+
+
+@bp.route("/static/css/admin.css", methods=["GET"])
+def serve_admin_css():
+    """Serve the unified CSS file."""
+    static_dir = os.path.join(os.path.dirname(__file__), '..', '..', 'static')
+    return send_from_directory(static_dir, 'css/admin.css')
+
+
+@bp.route("/static/js/admin.js", methods=["GET"])
+def serve_admin_js():
+    """Serve the unified JS file."""
+    static_dir = os.path.join(os.path.dirname(__file__), '..', '..', 'static')
+    return send_from_directory(static_dir, 'js/admin.js')