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/tsconfig.json

@@ -9,11 +9,19 @@
     "noImplicitReturns": true,
     "noFallthroughCasesInSwitch": true,
     "skipLibCheck": true,
-    "isolatedModules": true,
+    "esModuleInterop": true,
     "experimentalDecorators": true,
     "importHelpers": true,
     "target": "ES2022",
-    "module": "preserve"
+    "module": "ES2022",
+    "moduleResolution": "bundler",
+    "lib": [
+      "ES2022",
+      "dom"
+    ],
+    "useDefineForClassFields": false,
+    "baseUrl": "./",
+    "paths": {}
   },
   "angularCompilerOptions": {
     "enableI18nLegacyMessageIdFormat": false,