Refactor user account system and remove moderation integration

- Remove first_name and last_name fields from User model
- Add user deletion and social provider services
- Restructure auth serializers into separate directory
- Update avatar upload functionality and API endpoints
- Remove django-moderation integration documentation
- Add mandatory compliance enforcement rules
- Update frontend documentation with API usage examples

.clinerules/cline_rules.md

@@ -33,6 +33,19 @@
 ### CRITICAL DOCUMENTATION RULE
 - CRITICAL: After every change, it is MANDATORY to update docs/frontend.md with ALL documentation on how to use the updated API endpoints and features. Your edits to that file must be comprehensive and include all relevant details. If the file does not exist, you must create it and assume it is for a NextJS frontend.
 - CRITICAL: It is MANDATORY to include any types that need to be added to the frontend in docs/types-api.ts for NextJS as the file would appear in `src/types/api.ts` in the NextJS project exactly. Again, create it if it does not exist. Make sure it is in sync with docs/api.ts. Full type safety.
+- IT IS MANDATORY that api calls include a trailing forward slash. See example below. The forward slash may only be omitted if the end of the endpoint is a query parameter such as ``/companies/${query ? `?${query}` : ''}` or `/map/locations/${createQuery(params)}`.
+  Example:
+
+  ```
+  async updateAvatar(formData: FormData): Promise<User> {
+      return makeRequest('/auth/user/avatar/', {
+        method: 'POST',
+        body: formData,
+        headers: {}, // Let browser set Content-Type for FormData
+      });
+    },`
+  ```
+  - The types-api.ts file should import the types file as such `@/types/api` and not from any other location.
 - CRITICAL: It is MANDATORY to include any new API endpoints in docs/lib-api.ts for NextJS as the file would appear in `/src/lib/api.ts` in the NextJS project exactly. Again, create it if it does not exist. Make sure it is in sync with docs/types.ts. Full type safety.
 
 ### CRITICAL DATA RULE