Upgrade to Angular 19.1 with latest packages

- Upgrade from Angular 17.3 to Angular 19.1
- Switch back to @angular/build with Vite bundler
- Update to latest package versions:
  - @angular/core: 19.1.0
  - TypeScript: 5.8.0
  - tslib: 2.8.1
  - zone.js: 0.15.0
- Restore application builder configuration
- Bundle size: 349.98 kB raw / 92.00 kB gzipped

Angular 19.1 includes improvements and bug fixes that may resolve
package issues in restricted environments. The latest versions should
have better compatibility and more robust dependency resolution.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

frontend/angular.json

@@ -11,27 +11,24 @@
       "prefix": "app",
       "architect": {
         "build": {
-          "builder": "@angular-devkit/build-angular:browser",
+          "builder": "@angular/build:application",
           "options": {
-            "outputPath": "dist/frontend/browser",
+            "outputPath": "dist/frontend",
             "index": "src/index.html",
-            "main": "src/main.ts",
+            "browser": "src/main.ts",
             "polyfills": [
               "zone.js"
             ],
             "tsConfig": "tsconfig.app.json",
             "assets": [
-              "src/favicon.ico",
               {
                 "glob": "**/*",
-                "input": "public",
-                "output": "/"
+                "input": "public"
               }
             ],
             "styles": [
               "src/styles.css"
-            ],
-            "scripts": []
+            ]
           },
           "configurations": {
             "production": {
@@ -58,7 +55,7 @@
           "defaultConfiguration": "production"
         },
         "serve": {
-          "builder": "@angular-devkit/build-angular:dev-server",
+          "builder": "@angular/build:dev-server",
           "configurations": {
             "production": {
               "buildTarget": "frontend:build:production"
@@ -70,10 +67,10 @@
           "defaultConfiguration": "development"
         },
         "extract-i18n": {
-          "builder": "@angular-devkit/build-angular:extract-i18n"
+          "builder": "@angular/build:extract-i18n"
         },
         "test": {
-          "builder": "@angular-devkit/build-angular:karma",
+          "builder": "@angular/build:karma",
           "options": {
             "polyfills": [
               "zone.js",
@@ -81,11 +78,9 @@
             ],
             "tsConfig": "tsconfig.spec.json",
             "assets": [
-              "src/favicon.ico",
               {
                 "glob": "**/*",
-                "input": "public",
-                "output": "/"
+                "input": "public"
               }
             ],
             "styles": [