Add air-gapped deployment option for restricted environments

Added support for air-gapped and enterprise environments where npm package access is restricted, specifically addressing esbuild platform binary download issues.

**New Files:**
- Dockerfile.frontend.prebuilt: Alternative Dockerfile that uses pre-built Angular files
- DEPLOYMENT.md: Comprehensive deployment guide with two options

**Changes:**
- package.json: Added optionalDependencies for esbuild platform binaries
  - @esbuild/darwin-arm64
  - @esbuild/darwin-x64
  - @esbuild/linux-arm64
  - @esbuild/linux-x64

**Deployment Options:**

**Option 1 - Standard Build (current default):**
- Builds Angular in Docker
- Requires npm registry access
- Best for cloud/development

**Option 2 - Pre-built (for air-gapped):**
1. Build Angular locally: npm run build:prod
2. Change dockerfile in docker-compose.yml to Dockerfile.frontend.prebuilt
3. Docker only needs to copy files, no npm required
- No npm registry access needed during Docker build
- Faster, more reliable builds
- Best for enterprise/air-gapped/CI-CD

**Troubleshooting:**
See DEPLOYMENT.md for full troubleshooting guide including:
- esbuild platform binary issues
- Custom npm registry configuration
- Environment-specific recommendations

This addresses npm package access issues in restricted environments while maintaining flexibility for standard deployments.

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

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

frontend/package-lock.json

@@ -30,6 +30,12 @@
         "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"
       }
     },
     "node_modules/@ampproject/remapping": {
@@ -916,7 +922,6 @@
       "cpu": [
         "arm64"
       ],
-      "dev": true,
       "license": "MIT",
       "optional": true,
       "os": [
@@ -933,7 +938,6 @@
       "cpu": [
         "x64"
       ],
-      "dev": true,
       "license": "MIT",
       "optional": true,
       "os": [
@@ -1001,7 +1005,6 @@
       "cpu": [
         "arm64"
       ],
-      "dev": true,
       "license": "MIT",
       "optional": true,
       "os": [
@@ -1120,7 +1123,6 @@
       "cpu": [
         "x64"
       ],
-      "dev": true,
       "license": "MIT",
       "optional": true,
       "os": [