feat(pipeline): add Meltano + dbt + Airflow ELT pipeline scaffold

Replaces the hand-rolled integrator with a production-grade ELT pipeline
using Meltano (Singer taps), dbt Core (medallion architecture), and
Apache Airflow (orchestration). Adds Typesense for search and PostGIS
for geospatial queries.

- 6 custom Singer taps (GIAS, EES, Ofsted, Parent View, FBIT, IDACI)
- dbt project: 12 staging, 5 intermediate, 12 mart models
- 3 Airflow DAGs (daily/monthly/annual schedules)
- Typesense sync + batch geocoding scripts
- docker-compose: add Airflow, Typesense; upgrade to PostGIS
- Portainer stack definition matching live deployment topology

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

pipeline/meltano.yml

@@ -0,0 +1,114 @@
+version: 1
+project_id: school-compare-pipeline
+
+plugins:
+  extractors:
+    - name: tap-uk-gias
+      namespace: uk_gias
+      pip_url: ./plugins/extractors/tap-uk-gias
+      executable: tap-uk-gias
+      capabilities:
+        - catalog
+        - state
+      settings:
+        - name: download_url
+          kind: string
+          description: GIAS bulk CSV download URL
+          value: https://ea-edubase-api-prod.azurewebsites.net/edubase/downloads/public/edubasealldata.csv
+
+    - name: tap-uk-ees
+      namespace: uk_ees
+      pip_url: ./plugins/extractors/tap-uk-ees
+      executable: tap-uk-ees
+      capabilities:
+        - catalog
+        - state
+      settings:
+        - name: base_url
+          kind: string
+          value: https://content.explore-education-statistics.service.gov.uk/api/v1
+        - name: datasets
+          kind: array
+          description: List of EES dataset configs to extract
+
+    - name: tap-uk-ofsted
+      namespace: uk_ofsted
+      pip_url: ./plugins/extractors/tap-uk-ofsted
+      executable: tap-uk-ofsted
+      capabilities:
+        - catalog
+        - state
+      settings:
+        - name: mi_url
+          kind: string
+          description: Ofsted Management Information download URL
+
+    - name: tap-uk-parent-view
+      namespace: uk_parent_view
+      pip_url: ./plugins/extractors/tap-uk-parent-view
+      executable: tap-uk-parent-view
+      capabilities:
+        - catalog
+
+    - name: tap-uk-fbit
+      namespace: uk_fbit
+      pip_url: ./plugins/extractors/tap-uk-fbit
+      executable: tap-uk-fbit
+      capabilities:
+        - catalog
+        - state
+      settings:
+        - name: base_url
+          kind: string
+          value: https://financial-benchmarking-and-insights-tool.education.gov.uk/api
+
+    - name: tap-uk-idaci
+      namespace: uk_idaci
+      pip_url: ./plugins/extractors/tap-uk-idaci
+      executable: tap-uk-idaci
+      capabilities:
+        - catalog
+
+  loaders:
+    - name: target-postgres
+      variant: transferwise
+      pip_url: pipelinewise-target-postgres
+      config:
+        host: $PG_HOST
+        port: $PG_PORT
+        user: $PG_USER
+        password: $PG_PASSWORD
+        dbname: $PG_DATABASE
+        default_target_schema: raw
+
+  utilities:
+    - name: dbt-postgres
+      variant: dbt-labs
+      pip_url: dbt-postgres~=1.8
+      config:
+        project_dir: $MELTANO_PROJECT_ROOT/transform
+        profiles_dir: $MELTANO_PROJECT_ROOT/transform
+
+environments:
+  - name: dev
+    config:
+      plugins:
+        loaders:
+          - name: target-postgres
+            config:
+              host: localhost
+              port: 5432
+              user: postgres
+              password: postgres
+              dbname: school_compare
+  - name: production
+    config:
+      plugins:
+        loaders:
+          - name: target-postgres
+            config:
+              host: ${PG_HOST}
+              port: ${PG_PORT}
+              user: ${PG_USER}
+              password: ${PG_PASSWORD}
+              dbname: ${PG_DATABASE}