feat: migrate transform to 3-layer architecture with per-layer schemas

Remove raw/ layer — staging models now read landing JSON directly.
Rename all model schemas from padelnomics.* to staging.*/foundation.*/serving.*.
Web app queries updated to serving.planner_defaults via SERVING_DUCKDB_PATH.
Supervisor gets daily sleep interval between pipeline runs.

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

transform/sqlmesh_padelnomics/models/serving/planner_defaults.sql

@@ -8,7 +8,7 @@
 -- Units are explicit in column names (EUR, %, h). All monetary values in EUR.
 
 MODEL (
-  name padelnomics.planner_defaults,
+  name serving.planner_defaults,
   kind FULL,
   cron '@daily',
   grain city_slug
@@ -43,7 +43,7 @@ city_venue_density AS (
     population,
     venues_per_100k,
     market_score
-  FROM padelnomics.city_market_profile
+  FROM serving.city_market_profile
 )
 SELECT
   cvd.city_slug,