Add cron job functionality and Docker integration

Dockerfile

@@ -12,16 +12,22 @@ RUN go mod download
 # Copy source code
 COPY . .
 
-# Build the binary
+# Build the main binary
 RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build \
     -ldflags="-s -w" \
     -o /app/quoteforge \
     ./cmd/server
 
+# Build the cron binary
+RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build \
+    -ldflags="-s -w" \
+    -o /app/quoteforge-cron \
+    ./cmd/cron
+
 # Final stage
 FROM alpine:3.19
 
-RUN apk add --no-cache ca-certificates tzdata
+RUN apk add --no-cache ca-certificates tzdata cron
 
 # Create non-root user
 RUN adduser -D -g '' appuser
@@ -30,6 +36,14 @@ WORKDIR /app
 
 # Copy binary from builder
 COPY --from=builder /app/quoteforge .
+COPY --from=builder /app/quoteforge-cron .
+
+# Copy cron job configuration
+COPY crontab /etc/crontabs/appuser
+RUN chmod 0600 /etc/crontabs/appuser
+
+# Create log directory
+RUN mkdir -p /var/log/cron
 
 # Copy web templates and static files
 COPY --from=builder /app/web ./web