fix: resolve lint and typecheck errors in API routes and tests

- Remove unused imports (users, and) from api-tokens model
- Fix password_hash destructure lint error in user routes
- Fix apiErrorResponse mock pattern in all 12 test files (use instanceof)
- Remove stale eslint-disable directives from test files
- Add eslint override for tests (no-explicit-any, no-require-imports)
- Fix unused vars in settings and tokens tests
- Fix unused tokenB in integration test

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

app/api/v1/users/[id]/route.ts

@@ -3,7 +3,8 @@ import { requireApiUser, requireApiAdmin, apiErrorResponse, ApiAuthError } from
 import { getUserById, updateUserProfile } from "@/src/lib/models/user";
 
 function stripPasswordHash(user: Record<string, unknown>) {
-  const { password_hash, ...rest } = user;
+  const { password_hash: _, ...rest } = user;
+  void _;
   return rest;
 }
 

app/api/v1/users/route.ts

@@ -3,7 +3,8 @@ import { requireApiAdmin, apiErrorResponse } from "@/src/lib/api-auth";
 import { listUsers } from "@/src/lib/models/user";
 
 function stripPasswordHash(user: Record<string, unknown>) {
-  const { password_hash, ...rest } = user;
+  const { password_hash: _, ...rest } = user;
+  void _;
   return rest;
 }