fix: update npm ci flag from --only=production to --omit=dev and remove nginx build job

docs/DOCKER_BUILD_FIX.md

@@ -1,29 +1,43 @@
 # Docker Build Fix
 
-## Issue
-The Docker build was failing with the error:
+## Issues Fixed
+
+### 1. Database COPY Error
+The Docker build was failing with:
 ```
 ERROR: failed to solve: failed to compute cache key: failed to calculate checksum of ref: "/data/nodes.db": not found
 ```
 
-## Root Cause
-The Dockerfile contained an invalid COPY command that tried to use shell operators:
-```dockerfile
-# This doesn't work in Docker
-COPY --from=builder /app/data/nodes.db ./data/nodes.db 2>/dev/null || true
+### 2. Missing Dockerfile.nginx
+```
+ERROR: failed to solve: failed to read dockerfile: open Dockerfile.nginx: no such file or directory
 ```
 
+### 3. npm ci Production Flag
+```
+ERROR: failed to solve: process "/bin/sh -c npm ci --only=production && npm cache clean --force" did not complete successfully: exit code: 1
+```
+
+## Root Causes & Solutions
+
+### 1. Invalid COPY Syntax
 Docker's COPY command doesn't support shell operators like `2>/dev/null || true`.
 
-## Solution
-1. Removed the problematic COPY command
-2. Created the data directory with RUN instead
-3. Removed database pre-initialization from build stage
-4. Database is now initialized at runtime by the entrypoint script
+**Solution**: Removed the problematic COPY command and created data directory with RUN.
+
+### 2. Dockerfile.nginx Not Yet Implemented
+The GitHub Actions workflow referenced `Dockerfile.nginx` which is a Phase 2 feature.
+
+**Solution**: Commented out the nginx build job until Phase 2 implementation.
+
+### 3. Deprecated npm Flag
+The `--only=production` flag is deprecated in newer npm versions.
+
+**Solution**: Changed to `--omit=dev` which is the current syntax.
 
 ## Changes Made
 
-### Dockerfile
+### Dockerfile Changes
 ```diff
 - # Pre-initialize database during build
 - RUN mkdir -p /app/data && npm run rebuild || echo "Database will be initialized at runtime"
@@ -34,14 +48,23 @@ Docker's COPY command doesn't support shell operators like `2>/dev/null || true`
 - COPY --from=builder /app/data/nodes.db ./data/nodes.db 2>/dev/null || true
 + # Create data directory
 + RUN mkdir -p /app/data
+
+- RUN npm ci --only=production && \
++ RUN npm ci --omit=dev && \
+     npm cache clean --force
 ```
 
-### GitHub Actions Workflow
-Added conditional login to prevent failures on pull requests:
+### GitHub Actions Workflow Changes
 ```diff
 - name: Log in to GitHub Container Registry
 + if: github.event_name != 'pull_request'
   uses: docker/login-action@v3
+
+# Commented out nginx build until Phase 2
+- build-nginx:
+-   name: Build nginx-enhanced Docker Image
++ # build-nginx:
++ #   name: Build nginx-enhanced Docker Image
 ```
 
 ## Result