Add autocomplete functionality for parks: implement BaseAutocomplete class and integrate with forms

memory-bank/features/autocomplete/base.md

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+# Base Autocomplete Implementation
+
+The project uses `django-htmx-autocomplete` with a custom base implementation to ensure consistent behavior across all autocomplete widgets.
+
+## BaseAutocomplete Class
+
+Located in `core/forms.py`, the `BaseAutocomplete` class provides project-wide defaults and standardization:
+
+```python
+from core.forms import BaseAutocomplete
+
+class MyModelAutocomplete(BaseAutocomplete):
+    model = MyModel
+    search_attrs = ['name', 'description']
+```
+
+### Features
+
+- **Authentication Enforcement**: Requires user authentication by default
+  - Controlled via `AUTOCOMPLETE_BLOCK_UNAUTHENTICATED` setting
+  - Override `auth_check()` for custom auth logic
+
+- **Search Configuration**
+  - `minimum_search_length = 2` - More responsive than default 3
+  - `max_results = 10` - Optimized for performance
+
+- **Internationalization**
+  - All text strings use Django's translation system
+  - Customizable messages through class attributes
+
+### Usage Guidelines
+
+1. Always extend `BaseAutocomplete` instead of using `autocomplete.Autocomplete` directly
+2. Configure search_attrs based on your model's indexed fields
+3. Use the AutocompleteWidget with proper options:
+
+```python
+class MyForm(forms.ModelForm):
+    class Meta:
+        model = MyModel
+        fields = ['related_field']
+        widgets = {
+            'related_field': AutocompleteWidget(
+                ac_class=MyModelAutocomplete,
+                options={
+                    "multiselect": True,  # For M2M fields
+                    "placeholder": "Custom placeholder..."  # Optional
+                }
+            )
+        }
+```
+
+### Performance Considerations
+
+- Keep `search_attrs` minimal and indexed
+- Use `select_related`/`prefetch_related` in custom querysets
+- Consider caching for frequently used results
+
+### Security Notes
+
+- Authentication required by default
+- Implements proper CSRF protection via HTMX
+- Rate limiting should be implemented at the web server level