docs: map existing codebase with PAUL

- stack.md - PrestaShop 1.7.x, PHP, Smarty, SCSS, modules
- architecture.md - MVC + hooks, override mechanism, CQRS in src/
- structure.md - Directory layout, key file locations
- conventions.md - PHP/Smarty/SCSS/JS conventions, PS patterns
- testing.md - No automated tests in custom modules
- integrations.md - Allegro, Empik, BaseLinker, shipping, payments
- concerns.md - Override fragility, EOL risk, missing CI/CD
- db_schema.md - Custom tables, modified core tables

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

.paul/ROADMAP.md

@@ -0,0 +1,22 @@
+# Roadmap: interblue.pl
+
+## Overview
+Bieżące poprawki i rozwój istniejącego sklepu PrestaShop 1.7.x (interblue.pl) — elektronika oświetleniowa B2C.
+
+## Current Milestone
+**v0.1 Initial Release** (v0.1.0)
+Status: Not started
+Phases: 0 of TBD complete
+
+## Phases
+
+| Phase | Name | Plans | Status | Completed |
+|-------|------|-------|--------|-----------|
+| 1 | TBD | TBD | Not started | - |
+
+## Phase Details
+
+Phases will be defined during `/paul:plan`.
+
+---
+*Roadmap created: 2026-04-27*