Initial commit: tykkää.fi sivusto

- Julkaisualusta resepteille, neuloville, vinkeille
- PHP-backend (api.php) palvelinpuolen datalle
- Admin-paneeli salasanasuojauksella
- Kuvaupload (upload.php)

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

upload.php

@@ -0,0 +1,63 @@
+<?php
+/**
+ * tykkää.fi — kuvaupload-käsittelijä
+ * Tallentaa kuvat images/-kansioon.
+ */
+
+$allowed_mime = ['image/jpeg', 'image/png', 'image/gif', 'image/webp'];
+$max_bytes    = 8 * 1024 * 1024; // 8 Mt
+
+header('Content-Type: application/json');
+
+if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
+    http_response_code(405);
+    echo json_encode(['error' => 'Method not allowed']);
+    exit;
+}
+
+if (empty($_FILES['file'])) {
+    http_response_code(400);
+    echo json_encode(['error' => 'No file']);
+    exit;
+}
+
+$f = $_FILES['file'];
+
+if ($f['error'] !== UPLOAD_ERR_OK) {
+    http_response_code(400);
+    echo json_encode(['error' => 'Upload error: ' . $f['error']]);
+    exit;
+}
+
+if ($f['size'] > $max_bytes) {
+    http_response_code(413);
+    echo json_encode(['error' => 'File too large (max 8 MB)']);
+    exit;
+}
+
+$mime = mime_content_type($f['tmp_name']);
+if (!in_array($mime, $allowed_mime, true)) {
+    http_response_code(415);
+    echo json_encode(['error' => 'Only images (jpeg/png/gif/webp) allowed']);
+    exit;
+}
+
+$ext_map = ['image/jpeg' => '.jpg', 'image/png' => '.png',
+            'image/gif' => '.gif', 'image/webp' => '.webp'];
+$ext = $ext_map[$mime] ?? '.jpg';
+
+$dir = __DIR__ . '/images/';
+if (!is_dir($dir)) {
+    mkdir($dir, 0755, true);
+}
+
+$fname = round(microtime(true) * 1000) . $ext;
+$dest  = $dir . $fname;
+
+if (!move_uploaded_file($f['tmp_name'], $dest)) {
+    http_response_code(500);
+    echo json_encode(['error' => 'Failed to save file']);
+    exit;
+}
+
+echo json_encode(['url' => 'images/' . $fname]);