feat: add videodb media index with Docker stack

- Add videodb PHP/MySQL media collection manager (Blu-ray, DVD, CD)
- Dockerfile: PHP 8.1 + Apache with GD/mysqli/exif extensions
- docker-compose.yml: app on port 6761 + MySQL 8.0 with health checks
- docker-entrypoint.sh: auto-generates config.inc.php from env vars,
  waits for MySQL, initializes DB schema idempotently
- init-db.php: CLI schema installer using app's own prefix_query() logic
- Persistent volumes for DB, cache, and cover images

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

videodb/vendor/setasign/fpdf/tutorial/tuto2.php

@@ -0,0 +1,41 @@
+<?php
+require('../fpdf.php');
+
+class PDF extends FPDF
+{
+// Page header
+function Header()
+{
+	// Logo
+	$this->Image('logo.png',10,6,30);
+	// Arial bold 15
+	$this->SetFont('Arial','B',15);
+	// Move to the right
+	$this->Cell(80);
+	// Title
+	$this->Cell(30,10,'Title',1,0,'C');
+	// Line break
+	$this->Ln(20);
+}
+
+// Page footer
+function Footer()
+{
+	// Position at 1.5 cm from bottom
+	$this->SetY(-15);
+	// Arial italic 8
+	$this->SetFont('Arial','I',8);
+	// Page number
+	$this->Cell(0,10,'Page '.$this->PageNo().'/{nb}',0,0,'C');
+}
+}
+
+// Instanciation of inherited class
+$pdf = new PDF();
+$pdf->AliasNbPages();
+$pdf->AddPage();
+$pdf->SetFont('Times','',12);
+for($i=1;$i<=40;$i++)
+	$pdf->Cell(0,10,'Printing line number '.$i,0,1);
+$pdf->Output();
+?>