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

server/package.json

@@ -9,7 +9,10 @@
     "db:migrate": "prisma migrate dev",
     "db:push": "prisma db push",
     "db:generate": "prisma generate",
-    "db:seed": "tsx prisma/seed.ts"
+    "db:seed": "tsx prisma/seed.ts",
+    "typecheck": "tsc --noEmit",
+    "test": "vitest run",
+    "test:watch": "vitest"
   },
   "dependencies": {
     "@prisma/client": "^5.22.0",
@@ -18,8 +21,12 @@
     "dotenv": "^16.4.7",
     "express": "^4.21.2",
     "express-async-errors": "^3.1.0",
+    "express-rate-limit": "^7.5.0",
     "jsonwebtoken": "^9.0.2",
     "node-cron": "^3.0.3",
+    "pino": "^9.5.0",
+    "pino-http": "^10.3.0",
+    "pino-pretty": "^13.0.0",
     "zod": "^3.23.8"
   },
   "devDependencies": {
@@ -29,8 +36,11 @@
     "@types/jsonwebtoken": "^9.0.7",
     "@types/node": "^22.10.0",
     "@types/node-cron": "^3.0.11",
+    "@types/supertest": "^6.0.2",
     "prisma": "^5.22.0",
+    "supertest": "^7.0.0",
     "tsx": "^4.19.2",
-    "typescript": "^5.7.2"
+    "typescript": "^5.7.2",
+    "vitest": "^2.1.8"
   }
 }