docs: consolidate documentation into organized structure

- Move 12 markdown files from root to docs/ subdirectories
- Organize documentation by category:
  • docs/troubleshooting/ (1 file)  - Technical troubleshooting guides
  • docs/deployment/      (4 files) - Deployment and security documentation
  • docs/guides/          (3 files) - Feature-specific guides
  • docs/planning/        (4 files) - Planning and improvement proposals

Root directory cleanup:
- Reduced from 16 to 4 markdown files in root
- Only essential project files remain:
  • CLAUDE.md (AI instructions)
  • README.md (Main project readme)
  • CLEANUP_PLAN.md (Current cleanup plan)
  • SRC_STRUCTURE_IMPROVEMENTS.md (Structure improvements)

This improves:
✅ Documentation discoverability
✅ Logical organization by purpose
✅ Clean root directory
✅ Better maintainability

tests/debug/delete-smartlink-migrations.php

@@ -0,0 +1,14 @@
+<?php
+
+require __DIR__ . '/../../vendor/autoload.php';
+
+$pdo = new PDO(
+    'mysql:host=db;port=3306;dbname=michaelschiemer',
+    'mdb-user',
+    'StartSimple2024!'
+);
+
+$stmt = $pdo->prepare('DELETE FROM migrations WHERE version BETWEEN ? AND ?');
+$stmt->execute(['2025_01_01_000001', '2025_01_01_000005']);
+
+echo 'Deleted ' . $stmt->rowCount() . ' migration entries' . PHP_EOL;