refactor(transform): conform geographic dimension hierarchy via city_slug

Propagates the conformed city key (city_slug) from dim_venues through the
full pricing pipeline, eliminating 3 fragile LOWER(TRIM(...)) fuzzy string
joins with deterministic key joins.

Changes (cascading, task-by-task):
- dim_venues: add city_slug computed column (REGEXP_REPLACE slug derivation)
- dim_venue_capacity: join foundation.dim_venues instead of stg_playtomic_venues;
  carry city_slug alongside country_code/city
- fct_daily_availability: carry city_slug from dim_venue_capacity
- venue_pricing_benchmarks: carry city_slug from fct_daily_availability;
  add to venue_stats GROUP BY and final SELECT/GROUP BY
- city_market_profile: join vpb on city_slug = city_slug (was LOWER(TRIM))
- planner_defaults: add city_slug to city_benchmarks CTE; join on city_slug
- pseo_city_pricing: join city_market_profile on city_slug (was LOWER(TRIM))
- pipeline_routes._DAG: dim_venue_capacity now depends on dim_venues, not stg_playtomic_venues

Result: dim_venues.city_slug → dim_cities.(country_code, city_slug) forms a
fully conformed geographic hierarchy with no fuzzy string comparisons.

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

transform/sqlmesh_padelnomics/models/serving/city_market_profile.sql

@@ -57,7 +57,7 @@ WITH base AS (
   FROM foundation.dim_cities c
   LEFT JOIN serving.venue_pricing_benchmarks vpb
     ON c.country_code = vpb.country_code
-    AND LOWER(TRIM(c.city_name)) = LOWER(TRIM(vpb.city))
+    AND c.city_slug = vpb.city_slug
   WHERE c.padel_venue_count > 0
 ),
 scored AS (

transform/sqlmesh_padelnomics/models/serving/planner_defaults.sql

@@ -21,6 +21,7 @@ city_benchmarks AS (
   SELECT
     country_code,
     city,
+    city_slug,
     median_peak_rate,
     median_offpeak_rate,
     median_occupancy_rate,
@@ -128,7 +129,7 @@ SELECT
 FROM city_profiles cp
 LEFT JOIN city_benchmarks cb
   ON cp.country_code = cb.country_code
-  AND LOWER(TRIM(cp.city_name)) = LOWER(TRIM(cb.city))
+  AND cp.city_slug = cb.city_slug
 LEFT JOIN country_benchmarks ctb
   ON cp.country_code = ctb.country_code
 LEFT JOIN hardcoded_fallbacks hf

transform/sqlmesh_padelnomics/models/serving/pseo_city_pricing.sql

@@ -41,6 +41,6 @@ FROM serving.venue_pricing_benchmarks vpb
 -- Join city_market_profile to get the canonical city_slug and country metadata
 INNER JOIN serving.city_market_profile c
   ON  vpb.country_code = c.country_code
-  AND LOWER(TRIM(vpb.city)) = LOWER(TRIM(c.city_name))
+  AND vpb.city_slug = c.city_slug
 -- Only cities with enough venues for meaningful pricing statistics
 WHERE vpb.venue_count >= 2

transform/sqlmesh_padelnomics/models/serving/venue_pricing_benchmarks.sql

@@ -17,6 +17,7 @@ WITH venue_stats AS (
     da.tenant_id,
     da.country_code,
     da.city,
+    da.city_slug,
     da.price_currency,
     AVG(da.occupancy_rate)                              AS avg_occupancy_rate,
     MEDIAN(da.median_price)                             AS median_hourly_rate,
@@ -29,12 +30,13 @@ WITH venue_stats AS (
   WHERE TRY_CAST(da.snapshot_date AS DATE) >= CURRENT_DATE - INTERVAL '30 days'
     AND da.occupancy_rate IS NOT NULL
     AND da.occupancy_rate BETWEEN 0 AND 1.5
-  GROUP BY da.tenant_id, da.country_code, da.city, da.price_currency
+  GROUP BY da.tenant_id, da.country_code, da.city, da.city_slug, da.price_currency
   HAVING COUNT(DISTINCT da.snapshot_date) >= 3
 )
 SELECT
   country_code,
   city,
+  city_slug,
   price_currency,
   COUNT(*)                                              AS venue_count,
   -- Pricing benchmarks
@@ -54,4 +56,4 @@ SELECT
   SUM(days_observed)                                    AS total_venue_days_observed,
   CURRENT_DATE                                          AS refreshed_date
 FROM venue_stats
-GROUP BY country_code, city, price_currency
+GROUP BY country_code, city, city_slug, price_currency