Refactor park filtering system and templates

- Updated the filtered_list.html template to extend from base/base.html and improved layout and styling.
- Removed the park_list.html template as its functionality is now integrated into the filtered list.
- Added a new migration to create indexes for improved filtering performance on the parks model.
- Merged migrations to maintain a clean migration history.
- Implemented a ParkFilterService to handle complex filtering logic, aggregations, and caching for park filters.
- Enhanced filter suggestions and popular filters retrieval methods.
- Improved the overall structure and efficiency of the filtering system.

parks/migrations/0005_merge_20250820_2020.py

@@ -0,0 +1,13 @@
+# Generated by Django 5.2.5 on 2025-08-21 00:20
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("parks", "0001_add_filter_indexes"),
+        ("parks", "0004_fix_pghistory_triggers"),
+    ]
+
+    operations = []