feat: add organisation type demographic field to generic survey (#550)

* feat: Remove "clinical" from question B5

* feat: add organisation type demographic field to generic survey

Insert a new radio field at the top of the demographic section asking
respondents what type of organisation they work for (NHS Trust, NHS
England/ICB, local authority, VCFSE, primary care, or other).

This enables segmentation of responses across the different sectors
that use the generic survey.

Refs #519

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* chore: undo survey changes

* feat: add description field to organisation type question in generic survey config

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

---------

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: Joe-Heffer-Shef

data/survey_config/demography_only_config_generic.json

@@ -5,6 +5,23 @@
       "type": "demographic",
       "description": "Please fill in your demographic information",
       "fields": [
+        {
+          "type": "radio",
+          "label": "What type of organisation do you work for?",
+          "description": "",
+          "required": true,
+          "sublabels": [],
+          "options": [
+            "NHS Trust / Foundation Trust",
+            "NHS England / ICB / ICS",
+            "Local authority",
+            "Voluntary, Community, Faith, or Social Enterprise (VCFSE)",
+            "Primary care (GP practice, PCN, or similar)",
+            "Other"
+          ],
+          "disabled": false,
+          "readOnly": true
+        },
         {
           "type": "text",
           "label": "What is your age?",