feat: Implement Event File Hosted Data Fix and API Guide Update

Address critical data visibility issues for Event Files and enhance frontend documentation.

This commit resolves the persistent problem where top-level hosted file convenience fields
(e.g., , , ) were
returning as  in V3 Event File API responses, even when .

Key changes include:
- Refactored  Pydantic model:
    - Removed redundant  definitions from top-level hosted file convenience fields,
      allowing direct mapping from SQL view columns.
    - Simplified  to focus solely on conditionally loading the nested
       object, as top-level fields are now populated directly by Pydantic
      from the  view.
    - Added comprehensive comments to clarify data flow, Pydantic's behavior, and the
      expected origin of these convenience fields from SQL views.
- Updated :
    - Introduced a new section detailing how to retrieve Event File data, including the
      use of  to get both top-level convenience fields and a nested
       object.
    - Clarified all ID references as random string IDs.
    - Renumbered the troubleshooting section.
- Copied updated guide to .
- Continued ID Vision compliance audit, ensuring consistent handling of random string IDs
  across various core and event models (Account, Address, Contact, DataStore, Event Badge Template).
- Consolidated ID Vision E2E tests and updated related documentation.
- Minor updates to  and
  to support Event File data retrieval with .

app/routers/api_crud_v3.py

@@ -110,6 +110,7 @@ async def get_obj(
         obj_type_l1: str = Path(min_length=2, max_length=50),
         obj_id: str = Path(min_length=11, max_length=22),
         view: str = Query('default'),
+        inc_hosted_file: Optional[bool] = Query(False), # Added inc_hosted_file parameter
         account: AccountContext = Depends(get_account_context_optional),
         serialization: SerializationParams = Depends(),
         delay: DelayParams = Depends(),
@@ -150,6 +151,11 @@ async def get_obj(
                 
             if not check_account_access(sql_result, account, obj_name):
                 return mk_resp(data=False, status_code=403, response=response, status_message="Access denied. Record belongs to another account.")
+        
+        # Pass inc_hosted_file to the Pydantic model if applicable
+        if obj_name == 'event_file' and inc_hosted_file:
+            sql_result['inc_hosted_file'] = True
+
         resp_data = base_name(**sql_result).dict(by_alias=serialization.by_alias, exclude_unset=serialization.exclude_unset, exclude_defaults=serialization.exclude_defaults, exclude_none=serialization.exclude_none)
         return mk_resp(data=resp_data, response=response)
     else: