feat(detail): surface GIAS identity/contact details, drop unwired sections

Add seven school-identity fields to the detail header (both primary and
secondary views): age range, religious character, nursery and sixth-form
indicators as chips; telephone (tel: link), county and parliamentary
constituency as header details. religious_denomination, age_range and
has_sixth_form were already served; telephone, nursery_provision, county
and parliamentary_constituency are newly wired through the marts query
(with a NULL fallback for un-rebuilt marts, mirroring has_sixth_form) and
the school_info API response.

Remove three UI sections the backend never populated (always null): Year 1
Phonics, the SEN "types of additional needs" breakdown, and the average
class-size card — along with their now-dead props, route plumbing, and the
SenDetail/Phonics types + class_size_avg field.

Extend the e2e detail journey to assert the Phonics section is gone and the
new header fields render when the record carries them.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

backend/app.py

@@ -606,17 +606,21 @@ async def get_school_details(request: Request, urn: int):
             "religious_denomination": latest.get("religious_denomination", ""),
             "age_range": latest.get("age_range", ""),
             "has_sixth_form": latest.get("has_sixth_form"),
+            "nursery_provision": latest.get("nursery_provision"),
             "status": latest.get("status"),
             "latitude": latest.get("latitude"),
             "longitude": latest.get("longitude"),
             "phase": latest.get("phase"),
             # GIAS fields
             "website": latest.get("website"),
+            "telephone": latest.get("telephone"),
             "headteacher_name": latest.get("headteacher_name"),
             "capacity": latest.get("capacity"),
             "total_pupils": latest.get("gias_total_pupils"),
             "trust_name": latest.get("trust_name"),
             "gender": latest.get("gender"),
+            "county": latest.get("county"),
+            "parliamentary_constituency": latest.get("parliamentary_constituency"),
         }.items()
     }