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.
```

templates/changelog/changelog.html

@@ -10,6 +10,15 @@
         <div class="prose max-w-none">
             <p>Updates and changes to the site will be documented here, with the most recent changes listed first.</p>
 
+            <!-- New Entry for Endpoints Refactoring -->
+            <hr class="my-6">
+            <h2 class="text-xl font-semibold mb-2">March 31, 2025</h2>
+            <ul class="list-disc pl-5 space-y-1">
+                <li>Refactored endpoint listing/searching functionality into its own blueprint (`routes/endpoints.py`
+                    with `/endpoints` prefix).</li>
+                <li>Updated relevant `url_for` calls in templates to use the new `endpoints.` prefix.</li>
+            </ul>
+
             <!-- New Entry for SQL Explorer Refactoring -->
             <hr class="my-6">
             <h2 class="text-xl font-semibold mb-2">March 31, 2025</h2>