Restore nest coverage to >=80% after the #1209 dep bump (istanbul provider + branch tests) (#1213)

* fix(server): set oxc:false in vitest so the SWC transform survives the Vite 8 bump

* fix(server): switch coverage to the istanbul provider (v8 under-reports branches on Vite 8 + Vitest 4)

* test(nest): cover controller/service branches to clear the 80% coverage gate

server/package.json

@@ -21,13 +21,12 @@
     "test:coverage": "vitest run --coverage"
   },
   "dependencies": {
-    "@trek/shared": "*",
-    "tsconfig-paths": "^4.2.0",
     "@modelcontextprotocol/sdk": "^1.28.0",
     "@nestjs/common": "^11.1.24",
     "@nestjs/core": "^11.1.24",
     "@nestjs/platform-express": "^11.1.24",
     "@simplewebauthn/server": "^13.1.2",
+    "@trek/shared": "*",
     "archiver": "^6.0.1",
     "bcryptjs": "^2.4.3",
     "better-sqlite3": "^12.8.0",
@@ -47,6 +46,7 @@
     "reflect-metadata": "^0.2.2",
     "rxjs": "^7.8.2",
     "semver": "^7.7.4",
+    "tsconfig-paths": "^4.2.0",
     "tsx": "^4.21.0",
     "typescript": "^6.0.2",
     "undici": "^7.0.0",
@@ -67,16 +67,9 @@
   },
   "devDependencies": {
     "@eslint/js": "^10.0.1",
-    "@trivago/prettier-plugin-sort-imports": "^6.0.2",
-    "eslint-config-prettier": "^10.0.1",
-    "eslint-plugin-prettier": "^5.2.2",
-    "prettier": "^3.8.3",
-    "prettier-plugin-organize-imports": "^4.3.0",
-    "eslint": "^9.18.0",
-    "eslint-config-flat-gitignore": "^2.3.0",
-    "typescript-eslint": "^8.58.2",
     "@nestjs/testing": "^11.1.24",
     "@swc/core": "^1.15.40",
+    "@trivago/prettier-plugin-sort-imports": "^6.0.2",
     "@types/archiver": "^7.0.0",
     "@types/bcryptjs": "^2.4.6",
     "@types/better-sqlite3": "^7.6.13",
@@ -94,9 +87,17 @@
     "@types/unzipper": "^0.10.11",
     "@types/uuid": "^10.0.0",
     "@types/ws": "^8.18.1",
+    "@vitest/coverage-istanbul": "^4.1.9",
     "@vitest/coverage-v8": "^4.1.9",
+    "eslint": "^9.18.0",
+    "eslint-config-flat-gitignore": "^2.3.0",
+    "eslint-config-prettier": "^10.0.1",
+    "eslint-plugin-prettier": "^5.2.2",
     "nodemon": "^3.1.0",
+    "prettier": "^3.8.3",
+    "prettier-plugin-organize-imports": "^4.3.0",
     "supertest": "^7.2.2",
+    "typescript-eslint": "^8.58.2",
     "tz-lookup": "^6.1.25",
     "unplugin-swc": "^1.5.9",
     "vitest": "^4.1.9"