feat: Refactor endpoint listing into blueprint

- Moved endpoint listing and searching routes (`list_endpoints`, `search_endpoints`) and helper function (`get_routes`) from `app.py` into a new blueprint at `routes/endpoints.py`.
- Added `/endpoints` URL prefix to the blueprint.
- Registered the new `endpoints_bp` blueprint in `app.py`.
- Removed the original endpoint route definitions and helper function from `app.py`.
- Updated `url_for` calls in relevant templates (`endpoints.html`, `base.html`) to reference the new blueprint endpoints (e.g., `endpoints.list_endpoints`).
- Updated `templates/changelog/changelog.html` to document this refactoring.
```

routes/endpoints.py

@@ -0,0 +1,60 @@
+from flask import Blueprint, render_template, request, current_app
+from jinja2_fragments import render_block
+from flask_htmx import HTMX
+
+endpoints_bp = Blueprint('endpoints', __name__, url_prefix='/endpoints')
+htmx = HTMX()
+
+def _get_routes(app):
+    """Helper function to extract routes from the Flask app object."""
+    routes = []
+    for rule in app.url_map.iter_rules():
+        # Exclude static routes and HEAD/OPTIONS methods
+        if rule.endpoint == 'static':
+            continue
+        methods = ', '.join(sorted(rule.methods - {'HEAD', 'OPTIONS'}))
+        route_info = {
+            'endpoint': rule.endpoint,
+            'url': rule.rule,
+            'methods': methods,
+            'view_func': app.view_functions[rule.endpoint].__name__,
+            'doc': app.view_functions[rule.endpoint].__doc__
+        }
+        routes.append(route_info)
+    return routes
+
+@endpoints_bp.route('/')
+def list_endpoints():
+    """
+    Lists all API endpoints available in the Flask application.
+
+    This endpoint retrieves all registered routes, excluding static routes,
+    and displays their details such as endpoint name, URL, allowed HTTP methods,
+    view function name, and a brief description.
+    """
+    # Pass current_app to the helper function
+    routes = _get_routes(current_app)
+
+    if htmx:
+        # Assuming 'endpoints.html' uses a block named 'content'
+        return render_block(current_app.jinja_env, 'endpoints.html', 'content', routes=routes)
+    return render_template('endpoints.html', routes=routes)
+
+@endpoints_bp.route('/search')
+def search_endpoints():
+    """Searches and filters endpoints based on a query."""
+    # Pass current_app to the helper function
+    routes = _get_routes(current_app)
+    search = request.args.get('search', '').lower()
+    if search:
+        routes = [
+            route for route in routes
+            if search in route['endpoint'].lower()
+            or search in route['url'].lower()
+            or search in route['methods'].lower()
+            or search in route['view_func'].lower()
+            or (route.get('doc') and search in route['doc'].lower()) # Safer access to 'doc'
+        ]
+
+    # Renders the partial table
+    return render_template('partials/endpoints_table.html', routes=routes)