Add templates, tests, and miscellaneous project files

Includes new page templates (fitness-gym, nonprofit, online-course,
photography-studio, real-estate, startup-company, travel-blog,
wedding-invitation) with thumbnail SVGs, test specs, documentation
files, and minor updates to index.html, router.php, and playwright config.

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

router.php

@@ -16,10 +16,16 @@ if (strpos($uri, '/api/') === 0) {
     return true;
 }
 
-// Serve static files as-is
+// Serve static files
 $filePath = __DIR__ . $uri;
 if ($uri !== '/' && is_file($filePath)) {
-    return false; // Let PHP's built-in server handle the file
+    // Video files need range request support for seeking
+    $ext = strtolower(pathinfo($filePath, PATHINFO_EXTENSION));
+    if (in_array($ext, ['mp4', 'webm', 'ogg', 'mov'])) {
+        serveVideoWithRangeSupport($filePath, $ext);
+        return true;
+    }
+    return false; // Let PHP's built-in server handle other files
 }
 
 // Default: serve index.html for directory requests
@@ -31,3 +37,54 @@ if (is_dir($filePath)) {
 }
 
 return false;
+
+/**
+ * Serve video files with HTTP Range request support (required for seeking).
+ * PHP's built-in server does not support Range requests for static files.
+ */
+function serveVideoWithRangeSupport($filePath, $ext) {
+    $mimeTypes = [
+        'mp4'  => 'video/mp4',
+        'webm' => 'video/webm',
+        'ogg'  => 'video/ogg',
+        'mov'  => 'video/quicktime',
+    ];
+    $mime = $mimeTypes[$ext] ?? 'application/octet-stream';
+    $fileSize = filesize($filePath);
+
+    header('Accept-Ranges: bytes');
+    header('Content-Type: ' . $mime);
+
+    if (isset($_SERVER['HTTP_RANGE'])) {
+        // Parse range header: "bytes=start-end"
+        if (preg_match('/bytes=(\d+)-(\d*)/', $_SERVER['HTTP_RANGE'], $matches)) {
+            $start = intval($matches[1]);
+            $end = $matches[2] !== '' ? intval($matches[2]) : $fileSize - 1;
+
+            if ($start > $end || $start >= $fileSize) {
+                http_response_code(416);
+                header("Content-Range: bytes */$fileSize");
+                return;
+            }
+            $end = min($end, $fileSize - 1);
+            $length = $end - $start + 1;
+
+            http_response_code(206);
+            header("Content-Range: bytes $start-$end/$fileSize");
+            header("Content-Length: $length");
+
+            $fp = fopen($filePath, 'rb');
+            fseek($fp, $start);
+            $remaining = $length;
+            while ($remaining > 0 && !feof($fp)) {
+                $chunk = min(8192, $remaining);
+                echo fread($fp, $chunk);
+                $remaining -= $chunk;
+            }
+            fclose($fp);
+        }
+    } else {
+        header("Content-Length: $fileSize");
+        readfile($filePath);
+    }
+}