Simplify Dockerfile to use npm install (works without lockfiles)

Dockerfile

@@ -6,12 +6,9 @@ WORKDIR /app/frontend
 # Copy frontend package files
 COPY frontend/package*.json ./
 
-# Generate lockfile if it doesn't exist, then install dependencies
-RUN if [ ! -f package-lock.json ]; then \
-        echo "Generating package-lock.json..."; \
-        npm install --package-lock-only; \
-    fi && \
-    npm ci
+# Install all dependencies (including devDependencies for build)
+# Use npm install which works without lockfile
+RUN npm install
 
 # Copy frontend source and build
 COPY frontend/ ./
@@ -25,12 +22,8 @@ WORKDIR /app/backend
 # Copy backend package files
 COPY backend/package*.json ./
 
-# Generate lockfile if it doesn't exist, then install dependencies
-RUN if [ ! -f package-lock.json ]; then \
-        echo "Generating package-lock.json..."; \
-        npm install --package-lock-only; \
-    fi && \
-    npm ci
+# Install all dependencies (including TypeScript)
+RUN npm install
 
 # Copy backend source and compile TypeScript
 COPY backend/ ./
@@ -44,12 +37,8 @@ WORKDIR /app
 # Copy backend package files
 COPY backend/package*.json ./
 
-# Generate lockfile if it doesn't exist, then install production dependencies only
-RUN if [ ! -f package-lock.json ]; then \
-        echo "Generating package-lock.json..."; \
-        npm install --package-lock-only; \
-    fi && \
-    npm ci --omit=dev && \
+# Install production dependencies only
+RUN npm install --omit=dev && \
     npm cache clean --force
 
 # Copy compiled backend from builder