feat: add env setup wizard, fix docker-compose env passthrough and email from field

- Add interactive setup wizard (scripts/setup-env.js) with SQLite/PostgreSQL
  choice, AI provider config, email, MCP, admin account creation, and
  auto-switch of Prisma schema provider
- Fix docker-compose.yml: remove duplicate environment entries that overrode
  env_file values with empty strings (broke AI providers in Docker). Now only
  DATABASE_URL, NODE_ENV, NEXT_TELEMETRY_DISABLED remain in environment:
- Fix revalidateTag('system-config', '/settings') crash: Next.js 16 interprets
  the second arg as a cacheLife profile, not a path. Caused 500 on all admin
  settings saves
- Fix Resend "from" field: was building noreply@localhost which Resend rejects.
  Now uses SMTP_FROM from config, with localhost-aware fallback
- Add debug logging for auto-labeling background task
- Default DATABASE_URL changed from user:password to memento:memento

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

memento-note/lib/mail.ts

@@ -61,9 +61,24 @@ async function sendViaResend(apiKey: string, { to, subject, html, attachments }:
     const { Resend } = await import('resend');
     const resend = new Resend(apiKey);
 
-    const from = process.env.NEXTAUTH_URL
-      ? `Memento <noreply@${new URL(process.env.NEXTAUTH_URL).hostname}>`
-      : 'Memento <onboarding@resend.dev>';
+    // Build a valid "from" address for Resend
+    // Priority: SMTP_FROM from DB config > env var > derived from NEXTAUTH_URL > Resend default
+    const config = await getSystemConfig();
+    const smtpFrom = config.SMTP_FROM || process.env.SMTP_FROM;
+    let from: string;
+    if (smtpFrom) {
+      from = smtpFrom.includes('<') ? smtpFrom : `Memento <${smtpFrom}>`;
+    } else if (process.env.NEXTAUTH_URL) {
+      const hostname = new URL(process.env.NEXTAUTH_URL).hostname;
+      // Only use hostname-based from if it's not localhost (Resend rejects it)
+      if (hostname !== 'localhost') {
+        from = `Memento <noreply@${hostname}>`;
+      } else {
+        from = 'Memento <onboarding@resend.dev>';
+      }
+    } else {
+      from = 'Memento <onboarding@resend.dev>';
+    }
 
     // Resend supports attachments with inline content
     const resendAttachments = attachments?.map(att => ({