Downgrade to Angular 17 with webpack for better restricted environment compatibility

- Downgrade from Angular 19 to Angular 17.3.0
- Switch from Vite-based build (@angular/build) to webpack (@angular-devkit/build-angular)
- Eliminates Vite, esbuild, and rollup dependencies that were causing issues in restricted npm environments
- Update tsconfig.json for webpack compatibility (moduleResolution: bundler)
- Update angular.json to use browser builder instead of application builder
- Update docker-compose.yml to use prebuilt Dockerfile for air-gapped deployment
- Add build-for-airgap.sh helper script for local builds
- Update DEPLOYMENT.md with Angular 17 webpack strategy notes
- Bundle size: 329.73 kB raw / 86.54 kB gzipped

This change improves compatibility with enterprise environments that have restricted package registry access.

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

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

frontend/package.json

@@ -23,33 +23,29 @@
   },
   "private": true,
   "dependencies": {
-    "@angular/common": "^19.0.0",
-    "@angular/compiler": "^19.0.0",
-    "@angular/core": "^19.0.0",
-    "@angular/forms": "^19.0.0",
-    "@angular/platform-browser": "^19.0.0",
-    "@angular/router": "^19.0.0",
+    "@angular/animations": "^17.3.0",
+    "@angular/common": "^17.3.0",
+    "@angular/compiler": "^17.3.0",
+    "@angular/core": "^17.3.0",
+    "@angular/forms": "^17.3.0",
+    "@angular/platform-browser": "^17.3.0",
+    "@angular/platform-browser-dynamic": "^17.3.0",
+    "@angular/router": "^17.3.0",
     "rxjs": "~7.8.0",
     "tslib": "^2.3.0",
-    "zone.js": "~0.15.0"
+    "zone.js": "~0.14.3"
   },
   "devDependencies": {
-    "@angular/build": "^19.0.0",
-    "@angular/cli": "^19.0.0",
-    "@angular/compiler-cli": "^19.0.0",
+    "@angular-devkit/build-angular": "^17.3.0",
+    "@angular/cli": "^17.3.0",
+    "@angular/compiler-cli": "^17.3.0",
     "@types/jasmine": "~5.1.0",
-    "jasmine-core": "~5.9.0",
+    "jasmine-core": "~5.1.0",
     "karma": "~6.4.0",
     "karma-chrome-launcher": "~3.2.0",
     "karma-coverage": "~2.2.0",
     "karma-jasmine": "~5.1.0",
     "karma-jasmine-html-reporter": "~2.1.0",
-    "typescript": "~5.8.0"
-  },
-  "optionalDependencies": {
-    "@esbuild/darwin-arm64": "^0.25.4",
-    "@esbuild/darwin-x64": "^0.25.4",
-    "@esbuild/linux-arm64": "^0.25.4",
-    "@esbuild/linux-x64": "^0.25.4"
+    "typescript": "~5.4.2"
   }
 }