Remove SSR support and associated server-side code.

This change eliminates Angular server-side rendering (SSR) features, including related files, dependencies, and configurations, simplifying the codebase. The update also adjusts routing and references to support client-side rendering exclusively.

frontend/package.json

@@ -6,8 +6,7 @@
     "start": "ng serve",
     "build": "ng build",
     "watch": "ng build --watch --configuration development",
-    "test": "ng test",
-    "serve:ssr:frontend": "node dist/frontend/server/server.mjs"
+    "test": "ng test"
   },
   "private": true,
   "dependencies": {
@@ -17,10 +16,7 @@
     "@angular/forms": "^19.2.0",
     "@angular/platform-browser": "^19.2.0",
     "@angular/platform-browser-dynamic": "^19.2.0",
-    "@angular/platform-server": "^19.2.0",
     "@angular/router": "^19.2.0",
-    "@angular/ssr": "^19.2.5",
-    "express": "^4.18.2",
     "rxjs": "~7.8.0",
     "tslib": "^2.3.0",
     "zone.js": "~0.15.0"
@@ -29,9 +25,7 @@
     "@angular-devkit/build-angular": "^19.2.5",
     "@angular/cli": "^19.2.5",
     "@angular/compiler-cli": "^19.2.0",
-    "@types/express": "^4.17.17",
     "@types/jasmine": "~5.1.0",
-    "@types/node": "^18.18.0",
     "jasmine-core": "~5.6.0",
     "karma": "~6.4.0",
     "karma-chrome-launcher": "~3.2.0",
@@ -40,4 +34,4 @@
     "karma-jasmine-html-reporter": "~2.1.0",
     "typescript": "~5.7.2"
   }
-}
+}