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/angular.json

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