fix: post-flatten dev scripts, lead form validation, copy improvements

- Fix dev_run.sh and dev_setup.sh cd path (../.. after repo flatten)
- Quote form: re-render step 9 inline on validation error instead of
  flash + redirect to step 1; phone/email errors now show field-level
- Supplier FAQ: move differentiation Q to top, fix Q10 email to
  hello@ (was leads@), rename Q1 to "How do I get listed?"
- Replace Innenhalle → Indoorhalle throughout DE locale and seed script

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

research/product_ideas.md

@@ -65,6 +65,60 @@ Annual "Listed" tier = low-friction entry for suppliers who want visibility with
 - Make it **Pro-only** as a built-in perk (headline differentiator for Pro upgrade)
 - Possibly also available as a paid add-on boost for Growth tier
 
+## Company Registry Intelligence (Data / Programmatic SEO)
+
+Use public company registries to extract data on padel businesses — financials from annual
+filings, geocoded addresses, incorporation dates — and build:
+
+- **Padel Industry Profitability Index** — aggregate revenue/profit/assets across all filed
+  padel companies, updated annually. Unique linkable asset; journalists and investors will cite it.
+- **Company directory with financial health signals** — one page per company with location,
+  incorporation date, filed accounts summary, directors. Programmatic SEO at scale.
+- **Regional profitability map** — geocoded addresses + aggregated financials per region.
+  *"Which UK regions have the most profitable padel clubs?"*
+- **Growth timeline articles** — incorporation dates chart padel's rise.
+  *"UK padel company formations: 3 in 2018 → 47 in 2023 → 120+ in 2024"*
+- **Cross-country comparison** — once multi-country data is collected:
+  *"Where is padel most commercially mature?"*
+
+### Data sources
+
+| Country | Registry | API | Cost | Has Financials |
+|---------|----------|-----|------|----------------|
+| UK | Companies House | REST API | Free (600 req/5min) | Yes — turnover, P&L, assets |
+| Germany | Handelsregister | No official API | Northdata (freemium) | Limited |
+| Netherlands | KVK | Paid API | Monthly sub | Some |
+| France | INSEE Sirene | Bulk download | Free | No (accounts at INPI) |
+| Spain | Registro Mercantil | No free API | Commercialised | Paywall since 2011 |
+| Sweden | Bolagsverket | Good API | Free | Yes |
+
+### Start with UK
+
+- API key: developer.company-information.service.gov.uk (~5 min to get, free)
+- `GET /search/companies?q=padel` — full-text search works
+- SIC codes: `93110` (operation of sports facilities), `93130` (fitness facilities)
+- `GET /company/{number}/filing-history?category=accounts` → parse iXBRL for:
+  Turnover, ProfitLoss, TotalAssets, NetAssets, AverageNumberEmployees
+- Geocode postcodes via free OS Postcode API
+
+### Caveats
+- ~60% of small UK companies file abridged accounts (balance sheet only, no turnover)
+- Many padel clubs don't have "padel" in company name — cross-ref with existing venue DB
+- Holding structures can obscure revenue (rolls up to parent)
+- Germany: use northdata.de (no free official API)
+- Spain: genuinely closed since 2011
+
+### Technical sketch
+```
+companies_house_fetch.py  → search + paginate all padel companies
+filings_fetch.py          → download + parse iXBRL accounts per company
+geocode.py                → postcode → lat/lng (OS Postcode API)
+aggregate.py              → SQL: profitability index, regional groupings, YoY growth
+page_generator.py         → one page per company + index pages per region
+```
+Stack: `requests`, `lxml` (XBRL parsing), `sqlite3`. No heavy dependencies.
+
+
 ## Supplier Reviews (implementation sketch)
 - New table: `supplier_reviews (id, lead_forward_id, supplier_id, rating INT 1-5, body TEXT, created_at)`
 - Email trigger: worker job checks `lead_forwards` created 60+ days ago with no review → enqueue review request email