chore: rename codebase map files to lowercase

.paul/codebase/index.md

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+# orderPRO — Codebase Map
+
+**Generated:** 2026-04-26 | **Version:** 3.1.0-dev | **Milestone:** v3.1 Operational Enhancements
+
+## What Is This Project
+
+orderPRO is a **multi-channel order management system** for Polish e-commerce. It aggregates orders from Allegro (OAuth2) and shopPRO platforms, manages shipments via Apaczka and InPost APIs, generates PDF receipts/invoices, sends automated emails, and exposes a REST API for a Windows print client.
+
+## Quick Navigation
+
+| Document | Contents |
+|----------|----------|
+| [STACK.md](STACK.md) | PHP 8.4, custom framework, PDO, SCSS, PHPUnit, Composer deps |
+| [ARCHITECTURE.md](ARCHITECTURE.md) | MVC + Repository + Service layers, modules, routing, data flows |
+| [CONVENTIONS.md](CONVENTIONS.md) | Naming, code patterns, security, UI rules (from CLAUDE.md) |
+| [TESTING.md](TESTING.md) | PHPUnit 11.5, test patterns, coverage areas |
+| [INTEGRATIONS.md](INTEGRATIONS.md) | Allegro, shopPRO, Apaczka, InPost, Email, Print queue |
+| [CONCERNS.md](CONCERNS.md) | Tech debt, SonarQube issues, known bugs, performance |
+
+## Key Directories
+
+```
+src/Core/           Custom framework (router, PDO, session, logger, CSRF)
+src/Modules/        13 feature modules (Orders, Shipments, Accounting, Email, …)
+routes/web.php      All ~80 routes in one file
+resources/views/    PHP templates organized by module
+resources/scss/     SCSS sources → public/assets/css/
+database/migrations/ 84 SQL migration files (timestamped)
+tests/Unit/         PHPUnit tests for services
+.paul/docs/         ARCHITECTURE.md, DB_SCHEMA.md, TECH_CHANGELOG.md
+```
+
+## Current State
+
+- **Active phase:** 107 — Automation Email Send Once (planning)
+- **Last completed:** Phase 106 — Customer Return Alert (2026-04-22)
+- **Total migrations:** 84 (latest: `20260425_000102_create_automation_email_once_deliveries_table`)
+- **God classes to watch:** `OrdersRepository` (1221 LOC), `OrdersController` (1187 LOC), `AutomationService` (834 LOC)