Phase 1a: shared schemas, service layer, server tooling

- shared/schemas/: move Zod schemas out of routes so client + server share them
- shared/types.ts: inferred types and enums for cross-package use
- server tsconfig rootDir raised to ".." so shared/ compiles in-tree
- server/src/services/: ticket, comment, cti, user, auth, notification (stub), search (stub)
- Routes thinned to validate-delegate-return; business logic now testable in isolation
- server/src/lib/httpError.ts: typed HttpError replaces ad-hoc throw shapes
- server/src/lib/logger.ts: pino structured logging replaces console.log
- autoClose job delegates to ticketService.closeStale()
- express-rate-limit on /api/auth/login (10 / 15min / IP)
- vitest + vitest-mock-extended; 20 service-level tests cover auth, ticket, comment, user flows
- CI: lint + test jobs before docker builds

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

package-lock.json

@@ -7,6 +7,9 @@
     "": {
       "name": "ticketing-system",
       "version": "1.0.0",
+      "dependencies": {
+        "zod": "^3.23.8"
+      },
       "devDependencies": {
         "@eslint/js": "^9.17.0",
         "eslint": "^9.17.0",
@@ -3501,6 +3504,15 @@
       "funding": {
         "url": "https://github.com/sponsors/sindresorhus"
       }
+    },
+    "node_modules/zod": {
+      "version": "3.25.76",
+      "resolved": "https://registry.npmjs.org/zod/-/zod-3.25.76.tgz",
+      "integrity": "sha512-gzUt/qt81nXsFGKIFcC3YnfEAx5NkunCfnDlvuBSSFS02bcXu4Lmea0AFIUwbLWxWPx3d9p8S5QoaujKcNQxcQ==",
+      "license": "MIT",
+      "funding": {
+        "url": "https://github.com/sponsors/colinhacks"
+      }
     }
   }
 }