refactor(frontend): split 7 oversized pages into feature co-location

Per guide ch.7 page split pattern (skeleton orchestrates, private
components live in features/<domain>/):
- InstancePage 1716->328, UsersPage 1309->240, TicketsPage 1076->195,
  TicketDetailPage 911->287, QueriesPage 883->479, LdapConfigPage 860->393,
  WorkflowPage 852->194
- new feature modules: datasource/ rbac/ ticket/ query/ system/ldap/
  governance/workflow/ (components + hooks + types + utils)
- stable keys replace index keys in dynamic lists; polling intervals
  and toast call sites preserved 1:1 (verified by agents)
- filter/pagination state moved to URL query via new useQueryState hook
  (Instance/Users/Tickets/AuditLogs pages): refresh/share/back-button
  restore state; composite updates applied atomically
- permission pure functions extracted to lib/permissions.ts (used by
  useAuth + useLogin); page-size audit: 0 pages over 700-line budget

frontend/package.json

@@ -7,6 +7,11 @@
     "dev": "vite",
     "build": "vite build",
     "lint": "eslint .",
+    "lint:fix": "eslint . --fix",
+    "typecheck": "tsc --noEmit -p tsconfig.app.json",
+    "format": "prettier --write \"src/**/*.{ts,tsx,css}\"",
+    "format:check": "prettier --check \"src/**/*.{ts,tsx,css}\"",
+    "test": "vitest run",
     "audit:pages": "node scripts/audit-page-size.mjs 700",
     "preview": "vite preview"
   },
@@ -50,5 +55,14 @@
     "typescript": "~5.9.3",
     "typescript-eslint": "^8.46.4",
     "vite": "^7.2.4"
+  },
+  "lint-staged": {
+    "*.{ts,tsx}": [
+      "eslint --fix",
+      "prettier --write"
+    ],
+    "*.css": [
+      "prettier --write"
+    ]
   }
 }