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

src/Domain/SmartLink/Repositories/DatabaseSmartLinkRepository.php

@@ -0,0 +1,149 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Domain\SmartLink\Repositories;
+
+use App\Domain\SmartLink\Entities\SmartLink;
+use App\Domain\SmartLink\ValueObjects\LinkSettings;
+use App\Domain\SmartLink\Enums\LinkStatus;
+use App\Domain\SmartLink\Enums\LinkType;
+use App\Domain\SmartLink\ValueObjects\LinkTitle;
+use App\Domain\SmartLink\ValueObjects\ShortCode;
+use App\Domain\SmartLink\ValueObjects\SmartLinkId;
+use App\Framework\Core\ValueObjects\Timestamp;
+use App\Framework\Database\ConnectionInterface;
+use App\Framework\Database\ValueObjects\SqlQuery;
+
+final readonly class DatabaseSmartLinkRepository implements SmartLinkRepository
+{
+    public function __construct(
+        private ConnectionInterface $connection
+    ) {}
+
+    public function save(SmartLink $link): void
+    {
+        $sql = 'INSERT INTO smart_links (id, short_code, type, title, cover_image_url, status, user_id, settings, created_at, updated_at)
+             VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
+             ON DUPLICATE KEY UPDATE
+                type = VALUES(type),
+                title = VALUES(title),
+                cover_image_url = VALUES(cover_image_url),
+                status = VALUES(status),
+                settings = VALUES(settings),
+                updated_at = VALUES(updated_at)';
+
+        $query = SqlQuery::create($sql, [
+            $link->id->toString(),
+            $link->shortCode->toString(),
+            $link->type->value,
+            $link->title->toString(),
+            $link->coverImageUrl,
+            $link->status->value,
+            $link->userId,
+            json_encode($link->settings->toArray()),
+            $link->createdAt->format('Y-m-d H:i:s'),
+            $link->updatedAt->format('Y-m-d H:i:s'),
+        ]);
+
+        $this->connection->execute($query);
+    }
+
+    public function findById(SmartLinkId $id): ?SmartLink
+    {
+        $sql = 'SELECT * FROM smart_links WHERE id = ?';
+        $query = SqlQuery::create($sql, [$id->toString()]);
+        $result = $this->connection->query($query);
+        $row = $result->fetch();
+
+        return $row ? $this->hydrate($row) : null;
+    }
+
+    public function findByShortCode(ShortCode $shortCode): ?SmartLink
+    {
+        $sql = 'SELECT * FROM smart_links WHERE short_code = ?';
+        $query = SqlQuery::create($sql, [$shortCode->toString()]);
+        $result = $this->connection->query($query);
+        $row = $result->fetch();
+
+        return $row ? $this->hydrate($row) : null;
+    }
+
+    public function findByUserId(string $userId, ?LinkStatus $status = null): array
+    {
+        if ($status !== null) {
+            $sql = 'SELECT * FROM smart_links WHERE user_id = ? AND status = ? ORDER BY created_at DESC';
+            $query = SqlQuery::create($sql, [$userId, $status->value]);
+        } else {
+            $sql = 'SELECT * FROM smart_links WHERE user_id = ? ORDER BY created_at DESC';
+            $query = SqlQuery::create($sql, [$userId]);
+        }
+
+        $result = $this->connection->query($query);
+        $rows = $result->fetchAll();
+
+        return array_map(fn(array $row) => $this->hydrate($row), $rows);
+    }
+
+    public function existsShortCode(ShortCode $shortCode): bool
+    {
+        $sql = 'SELECT COUNT(*) as count FROM smart_links WHERE short_code = ?';
+        $query = SqlQuery::create($sql, [$shortCode->toString()]);
+        $result = $this->connection->query($query);
+        $count = $result->fetch();
+
+        return ($count['count'] ?? 0) > 0;
+    }
+
+    public function delete(SmartLinkId $id): void
+    {
+        $sql = 'DELETE FROM smart_links WHERE id = ?';
+        $query = SqlQuery::create($sql, [$id->toString()]);
+        $this->connection->execute($query);
+    }
+
+    public function findActiveLinks(): array
+    {
+        $sql = 'SELECT * FROM smart_links WHERE status = ? ORDER BY created_at DESC';
+        $query = SqlQuery::create($sql, [LinkStatus::ACTIVE->value]);
+        $result = $this->connection->query($query);
+        $rows = $result->fetchAll();
+
+        return array_map(fn(array $row) => $this->hydrate($row), $rows);
+    }
+
+    public function getTotalClicks(SmartLinkId $id): int
+    {
+        $sql = 'SELECT COUNT(*) as count FROM click_events WHERE link_id = ?';
+        $query = SqlQuery::create($sql, [$id->toString()]);
+        $result = $this->connection->query($query);
+        $row = $result->fetch();
+
+        return (int) ($row['count'] ?? 0);
+    }
+
+    private function hydrate(array $row): SmartLink
+    {
+        $settings = json_decode($row['settings'], true);
+
+        return new SmartLink(
+            id: SmartLinkId::fromString($row['id']),
+            shortCode: ShortCode::fromString($row['short_code']),
+            type: LinkType::from($row['type']),
+            title: LinkTitle::fromString($row['title']),
+            coverImageUrl: $row['cover_image_url'],
+            status: LinkStatus::from($row['status']),
+            userId: $row['user_id'],
+            settings: new LinkSettings(
+                trackClicks: (bool) $settings['track_clicks'],
+                enableGeoRouting: (bool) $settings['enable_geo_routing'],
+                showPreview: (bool) $settings['show_preview'],
+                customDomain: $settings['custom_domain'] ?? null,
+                clickLimit: $settings['click_limit'] ?? null,
+                password: $settings['password'] ?? null
+            ),
+            createdAt: Timestamp::fromDateTime(new \DateTimeImmutable($row['created_at'])),
+            updatedAt: Timestamp::fromDateTime(new \DateTimeImmutable($row['updated_at']))
+        );
+    }
+}