chore: remove the Ofsted Parent View feature end to end

Removes the 'What Parents Say' section and all supporting elements:

Frontend:
- Drop the OfstedParentView type, the parent_view field, the survey
  section and the 'X% would recommend' callouts in the primary and
  secondary detail views, the Parents nav item, and the parent-view CSS.

Backend:
- Remove the FactParentView model, its loading in data_loader, and
  parent_view from the school-details API response.
- Bump SCHEMA_VERSION to 6 and add an idempotent drop step
  (DROP TABLE IF EXISTS marts.fact_parent_view) to the CLI migration;
  add scripts/sql/drop_fact_parent_view.sql to apply directly to the
  dbt-owned marts DBs on staging and prod.

Pipeline:
- Delete the stg_parent_view + fact_parent_view dbt models and their
  source/schema entries, the tap-uk-parent-view Meltano extractor, and
  the monthly Parent View DAG; drop it from the Dockerfile and the
  staging bootstrap docs.

The rest of dbt (which builds every mart the app reads) is untouched.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

pipeline/dags/school_data_pipeline.py

@@ -156,31 +156,6 @@ with DAG(
     extract_ees_group >> dbt_build_ees >> sync_typesense_ees
 
 
-# ── Monthly DAG (Parent View) ──────────────────────────────────────────
-
-with DAG(
-    dag_id="school_data_monthly_parent_view",
-    default_args=default_args,
-    description="Monthly Ofsted Parent View extraction and transform",
-    schedule="0 3 1 * *",
-    start_date=datetime(2025, 1, 1),
-    catchup=False,
-    tags=["school-compare", "monthly"],
-) as monthly_parent_view_dag:
-
-    extract_parent_view = BashOperator(
-        task_id="extract_parent_view",
-        bash_command=f"cd {PIPELINE_DIR} && {MELTANO_BIN} run tap-uk-parent-view target-postgres",
-    )
-
-    dbt_build_parent_view = BashOperator(
-        task_id="dbt_build",
-        bash_command=f"cd {PIPELINE_DIR}/transform && {DBT_BIN} build --profiles-dir . --target production --select stg_parent_view+ fact_parent_view+",
-    )
-
-    extract_parent_view >> dbt_build_parent_view
-
-
 # ── Annual DAG (IDACI Deprivation) ────────────────────────────────────
 
 with DAG(