docs: update docs and PROJECT.md for dual score pipeline

Task 8: documentation updates for the dual market score feature.

- CHANGELOG.md: comprehensive [Unreleased] entries for all additions
  (Marktpotenzial-Score, tennis courts, dim_locations, GeoNames expansion,
  DuckDB spatial, SOPS secrets, methodology page updates)
- docs/data-sources-inventory.md: add tennis courts Overpass row, update
  GeoNames entry (cities1000, username=padelnomics, higher score)
- transform/sqlmesh_padelnomics/CLAUDE.md: add dim_locations to conformed
  dimensions table, update source integration map with new pipeline branch,
  document ST_Distance_Sphere bounding-box pattern
- PROJECT.md: add dual score to In Progress, add Gemeinde pSEO + top-50
  ranking page to Next Up, add data backlog items (sports_centre, NUTS-3,
  opportunity map), add Decisions Log entry

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

PROJECT.md

@@ -135,7 +135,7 @@
 
 ## In Progress 🔄
 
-_Move here when you start working on it._
+- [ ] **Dual market score system** — Marktreife-Score + Marktpotenzial-Score + expanded data pipeline (merging to master)
 
 ---
 
@@ -155,6 +155,13 @@ _Move here when you start working on it._
 | Submit sitemap to Google Search Console | Set up Google Search Console + Bing Webmaster Tools (SEO hub ready — just add env vars) |
 | Verify Litestream R2 backup running on prod | |
 
+### Gemeinde-level pSEO (follow-up from dual score work)
+
+| 🛠 Tech |
+|--------|
+| Gemeinde-level pSEO article template — consumes `location_opportunity_profile` data, targets "Padel in [Ort]" + "Padel bauen in [Ort]" queries (zero SERP competition confirmed) |
+| "Top 50 underserved locations" ranking page — high-value SEO content, fully programmatic from `location_opportunity_profile` ORDER BY opportunity_score DESC |
+
 ### Week 1–2 — First Revenue
 
 | 🛠 Tech | 📣 Business |
@@ -196,6 +203,9 @@ _Move here when you start working on it._
 - [ ] Padel Hall Accelerator (€999 — report + call + supplier intros)
 
 ### Data & Intelligence
+- [ ] Sports centre Overpass extract (`leisure=sports_centre`) — additional market signal for `dim_locations`
+- [ ] City-level income enrichment (Eurostat NUTS-3 regional income — replaces country-level PPS proxy, higher granularity)
+- [ ] Interactive opportunity map / explorer in web app (map UI over `location_opportunity_profile` — bounding box queries via ST_Distance_Sphere)
 - [ ] Multi-source data aggregation (add booking platforms beyond Playtomic)
 - [ ] Google Maps signals (reviews, ratings)
 - [ ] Weather + demographic overlays
@@ -246,3 +256,4 @@ _Move here when you start working on it._
 | 2026-02-22 | Credit system over pay-per-lead blast | Suppliers self-select → higher quality perception; scales without manual intervention |
 | 2026-02-22 | No soft email gate on planner | Planner already captures emails at natural points (scenario save → login, quote wizard step 9). Gate would add friction without meaningful list value. Revisit if data shows a gap. |
 | 2026-02-22 | Wipe test suppliers before launch | 5 `example.com` entries from seed_dev_data.py — empty directory with "Be the first" CTA is better than obviously fake data |
+| 2026-02-24 | Split market score into two branded scores | Marktreife-Score (existing market maturity, cities with ≥1 venue) vs Marktpotenzial-Score (greenfield opportunity, all GeoNames locations globally). SERP analysis confirmed zero competition for hyperlocal Gemeinde-level market intelligence pages. |