fix(portal): security hardening for pilot readiness

- C1: Rewrite /api/usage to resolve teamId server-side from tenant CR;
  customers can no longer pass arbitrary teamId (IDOR fix)
- C2: Remove POST /api/tenants — tenants are only created via admin
  approval flow
- H1: Validate packages against catalog, workspaceFiles against allowlist,
  and field lengths in PATCH /api/tenants/[name]
- H2: Remove full ZITADEL profile claims logging from JWT callback
- H3: Add safeError() utility; sanitize all error responses to clients,
  toggle raw errors via PORTAL_DEBUG_ERRORS=true
- H4/H5: Escape HTML entities in all email templates (contactName,
  companyName, adminNotes)

src/lib/auth.ts

@@ -39,7 +39,6 @@ export const authConfig: NextAuthConfig = {
   callbacks: {
     async jwt({ token, account, profile }) {
       if (account && profile) {
-        console.log("ZITADEL profile claims:", JSON.stringify(profile, null, 2));
         const claims = profile as unknown as ZitadelClaims;
         token.orgId = claims["urn:zitadel:iam:user:resourceowner:id"];
         token.orgName = claims["urn:zitadel:iam:user:resourceowner:name"];