Make the per-owner project cap configurable via env

Self-hosters shouldn't be stuck with a hardcoded 100-project limit;
MAX_PROJECTS_PER_OWNER now controls it, defaulting to 0 (unlimited).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/Support/Config.php

@@ -25,6 +25,8 @@ final class Config
         public readonly string $webauthnRpName,
         /** Minimum gap between magic links sent to the same address. */
         public readonly int $resendIntervalSeconds,
+        /** Maximum number of projects a single owner may create. 0 means unlimited. */
+        public readonly int $maxProjectsPerOwner,
         public readonly MailConfig $mail,
     ) {
     }
@@ -59,6 +61,7 @@ final class Config
         $webauthnRpName = self::env('WEBAUTHN_RP_NAME', 'Projects');
 
         $resendIntervalSeconds = (int) (self::env('MAGIC_LINK_RESEND_SECONDS') ?? '60');
+        $maxProjectsPerOwner = (int) (self::env('MAX_PROJECTS_PER_OWNER') ?? '0');
 
         $mailLogPath = self::env('MAIL_LOG_PATH', $storagePath . '/mail.log');
         if (!self::isAbsolutePath($mailLogPath)) {
@@ -87,6 +90,7 @@ final class Config
             $webauthnRpId,
             $webauthnRpName,
             $resendIntervalSeconds,
+            $maxProjectsPerOwner,
             $mail,
         );
     }