docs: rename to SimpleShop in docs, plan full rename for later

- Update README title to "SimpleShop"
- Update ROADMAP title to "SimpleShop Roadmap"
- Add "Rename Project to SimpleShop" to Technical Debt section
  with list of files that would need updating

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

README.md

@@ -1,4 +1,4 @@
-# SimpleshopTheme
+# SimpleShop
 
 A beautiful, customisable e-commerce storefront built with Phoenix LiveView. Designed for print-on-demand sellers who want professional shops without design expertise.
 

ROADMAP.md

@@ -1,4 +1,4 @@
-# SimpleshopTheme Roadmap
+# SimpleShop Roadmap
 
 This document tracks future improvements, features, and known gaps.
 
@@ -133,6 +133,21 @@ Phase 9 testing is basic. Areas needing better coverage:
 - Graceful degradation when theme settings are invalid
 - Network error handling in LiveView
 
+### Rename Project to SimpleShop
+**Status:** Not implemented
+**Effort:** Medium
+
+The project is currently named `simpleshop_theme` (reflecting its origins as a theme system), but it's now a full e-commerce storefront. Rename to `simple_shop` or `simpleshop` to reflect this.
+
+**Files to update:**
+- `mix.exs` - app name
+- `lib/simpleshop_theme/` → `lib/simple_shop/`
+- `lib/simpleshop_theme_web/` → `lib/simple_shop_web/`
+- All module names (`SimpleshopTheme` → `SimpleShop`)
+- `config/*.exs` - endpoint and repo references
+- `test/` directories
+- Database file name
+
 ---
 
 ## Completed (For Reference)