chore: remove unused packages, imports, and stale type definitions

- Remove @casl/prisma (unused) from backend
- Remove @heroicons/react (unused, using lucide-react) from frontend
- Remove unused InferSubjects import from ability.factory.ts
- Remove unused Calendar import from Dashboard.tsx
- Delete stale frontend/src/lib/types.ts (duplicate of src/types/index.ts)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

backend/package-lock.json

@@ -11,7 +11,6 @@
       "dependencies": {
         "@anthropic-ai/sdk": "^0.72.1",
         "@casl/ability": "^6.8.0",
-        "@casl/prisma": "^1.6.1",
         "@nestjs/axios": "^4.0.1",
         "@nestjs/common": "^10.3.0",
         "@nestjs/config": "^3.1.1",
@@ -791,20 +790,6 @@
         "url": "https://github.com/stalniy/casl/blob/master/BACKERS.md"
       }
     },
-    "node_modules/@casl/prisma": {
-      "version": "1.6.1",
-      "resolved": "https://registry.npmjs.org/@casl/prisma/-/prisma-1.6.1.tgz",
-      "integrity": "sha512-VSAzfTMOZvP3Atj3F0qwJItOm1ixIiumjbBz21PL/gLUIDwoktyAx2dB7dPwjH9AQvzZPE629ee7fVU5K2hpzg==",
-      "license": "MIT",
-      "dependencies": {
-        "@ucast/core": "^1.10.0",
-        "@ucast/js": "^3.0.1"
-      },
-      "peerDependencies": {
-        "@casl/ability": "^5.3.0 || ^6.0.0",
-        "@prisma/client": "^2.14.0 || ^3.0.0 || ^4.0.0 || ^5.0.0 || ^6.0.0 || ^7.0.0"
-      }
-    },
     "node_modules/@colors/colors": {
       "version": "1.5.0",
       "resolved": "https://registry.npmjs.org/@colors/colors/-/colors-1.5.0.tgz",

backend/package.json

@@ -26,7 +26,6 @@
   "dependencies": {
     "@anthropic-ai/sdk": "^0.72.1",
     "@casl/ability": "^6.8.0",
-    "@casl/prisma": "^1.6.1",
     "@nestjs/axios": "^4.0.1",
     "@nestjs/common": "^10.3.0",
     "@nestjs/config": "^3.1.1",

backend/src/auth/abilities/ability.factory.ts

@@ -1,4 +1,4 @@
-import { AbilityBuilder, PureAbility, AbilityClass, ExtractSubjectType, InferSubjects } from '@casl/ability';
+import { AbilityBuilder, PureAbility, AbilityClass, ExtractSubjectType } from '@casl/ability';
 import { Injectable } from '@nestjs/common';
 import { Role, User, VIP, Driver, ScheduleEvent, Flight, Vehicle } from '@prisma/client';