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/plugins/extractors/tap-uk-ofsted/pyproject.toml

@@ -0,0 +1,18 @@
+[build-system]
+requires = ["setuptools>=68", "wheel"]
+build-backend = "setuptools.build_meta"
+
+[project]
+name = "tap-uk-ofsted"
+version = "0.1.0"
+description = "Singer tap for UK Ofsted Management Information"
+requires-python = ">=3.10"
+dependencies = [
+    "singer-sdk~=0.39",
+    "requests>=2.31",
+    "pandas>=2.0",
+    "odfpy>=1.4",
+]
+
+[project.scripts]
+tap-uk-ofsted = "tap_uk_ofsted.tap:TapUKOfsted.cli"