Add ESLint + Prettier + EditorConfig tooling at repo root

v1.0 Phase 1.1 — repo-wide lint/format baseline.

- eslint.config.mjs (flat config) lints server, client, shared
- .prettierrc.json, .prettierignore, .editorconfig, .nvmrc
- Root package.json holds shared devDeps; per-package scripts keep
  their typecheck + test runners
- Fix 7 lint issues surfaced by the baseline run:
  - TicketDetail.tsx: replace ternary-with-side-effects with if/else
  - admin/Users.tsx: escape apostrophe in JSX
  - errorHandler.ts: typed err as unknown with ErrorLike refinement
  - users.ts: Prisma.UserUpdateInput instead of Record<string, any>
  - seed.ts: drop unused goddard binding
- Run prettier across tracked sources for a clean formatting baseline

client/src/components/Modal.tsx

@@ -1,39 +1,40 @@
-import { ReactNode, useEffect } from 'react'
-import { X } from 'lucide-react'
+import { ReactNode, useEffect } from 'react';
+import { X } from 'lucide-react';
 
 interface ModalProps {
-  title: string
-  onClose: () => void
-  children: ReactNode
-  size?: 'md' | 'lg'
+  title: string;
+  onClose: () => void;
+  children: ReactNode;
+  size?: 'md' | 'lg';
 }
 
 export default function Modal({ title, onClose, children, size = 'md' }: ModalProps) {
   useEffect(() => {
     const handler = (e: KeyboardEvent) => {
-      if (e.key === 'Escape') onClose()
-    }
-    document.addEventListener('keydown', handler)
-    return () => document.removeEventListener('keydown', handler)
-  }, [onClose])
+      if (e.key === 'Escape') onClose();
+    };
+    document.addEventListener('keydown', handler);
+    return () => document.removeEventListener('keydown', handler);
+  }, [onClose]);
 
   return (
     <div
       className="fixed inset-0 z-50 flex items-center justify-center bg-black/70 backdrop-blur-sm"
-      onClick={(e) => { if (e.target === e.currentTarget) onClose() }}
+      onClick={(e) => {
+        if (e.target === e.currentTarget) onClose();
+      }}
     >
-      <div className={`bg-gray-900 border border-gray-800 rounded-xl shadow-2xl w-full mx-4 ${size === 'lg' ? 'max-w-2xl' : 'max-w-md'}`}>
+      <div
+        className={`bg-gray-900 border border-gray-800 rounded-xl shadow-2xl w-full mx-4 ${size === 'lg' ? 'max-w-2xl' : 'max-w-md'}`}
+      >
         <div className="flex items-center justify-between px-6 py-4 border-b border-gray-800">
           <h3 className="text-base font-semibold text-gray-100">{title}</h3>
-          <button
-            onClick={onClose}
-            className="text-gray-500 hover:text-gray-300 transition-colors"
-          >
+          <button onClick={onClose} className="text-gray-500 hover:text-gray-300 transition-colors">
             <X size={18} />
           </button>
         </div>
         <div className="px-6 py-5">{children}</div>
       </div>
     </div>
-  )
+  );
 }