feat(data): integrate 9 UK government data sources via Kestra

Adds a full data integration pipeline for enriching school profiles with
supplementary data from Ofsted, GIAS, EES, IDACI, and FBIT.

Backend:
- Bump SCHEMA_VERSION to 3; add 8 new DB tables (ofsted_inspections,
  ofsted_parent_view, school_census, admissions, sen_detail, phonics,
  school_deprivation, school_finance) plus GIAS columns on schools
- Expose all supplementary data via GET /api/schools/{urn}
- Enrich school list responses with ofsted_grade + ofsted_date

Integrator (new service):
- FastAPI HTTP microservice; Kestra calls POST /run/{source}
- 9 source modules: ofsted, gias, parent_view, census, admissions,
  sen_detail, phonics, idaci, finance
- 9 Kestra flow YAMLs with scheduled triggers and 3× retry

Frontend:
- SchoolRow: colour-coded Ofsted badge (Outstanding/Good/RI/Inadequate)
- SchoolDetailView: 7 new sections — Ofsted sub-judgements, Parent View
  survey bars, Admissions, Pupils & Inclusion / SEN, Phonics, Deprivation
  Context, Finances
- types.ts: 8 new interfaces + extended School/SchoolDetailsResponse

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

integrator/flows/census.yml

@@ -0,0 +1,25 @@
+id: census-annual-update
+namespace: schoolcompare.data
+description: Download and load School Census (SPC) data via EES API
+
+triggers:
+  - id: annual-schedule
+    type: io.kestra.plugin.core.trigger.Schedule
+    cron: "0 4 1 9 *"   # 1 September annually at 04:00
+
+tasks:
+  - id: download
+    type: io.kestra.plugin.core.http.Request
+    uri: http://integrator:8001/run/census?action=download
+    method: POST
+    timeout: PT20M
+
+  - id: load
+    type: io.kestra.plugin.core.http.Request
+    uri: http://integrator:8001/run/census?action=load
+    method: POST
+    timeout: PT30M
+
+retry:
+  maxAttempts: 3
+  delay: PT15M