feat: implement worker-runner sidecar pattern for n8n

replace replicated workers/runners with dynamically generated 1:1
worker-runner pairs where each runner connects to its worker via
localhost (network_mode: service). this improves task routing by
ensuring each worker has dedicated runner capacity.

add generate_n8n_workers.sh script to create docker-compose.n8n-workers.yml

scripts/generate_n8n_workers.sh

@@ -0,0 +1,80 @@
+#!/bin/bash
+# Генерирует docker-compose.n8n-workers.yml с N парами worker-runner
+# Использование: N8N_WORKER_COUNT=3 bash scripts/generate_n8n_workers.sh
+#
+# Этот скрипт идемпотентен - при повторном запуске файл перезаписывается
+
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+PROJECT_DIR="$(dirname "$SCRIPT_DIR")"
+
+# Source utilities if available
+if [[ -f "$SCRIPT_DIR/utils.sh" ]]; then
+    source "$SCRIPT_DIR/utils.sh"
+else
+    # Fallback logging functions
+    log_info() { echo "[INFO] $*"; }
+    log_warning() { echo "[WARN] $*"; }
+    log_error() { echo "[ERROR] $*" >&2; }
+fi
+
+# Загрузить N8N_WORKER_COUNT из .env если не задан
+if [[ -z "${N8N_WORKER_COUNT:-}" ]] && [[ -f "$PROJECT_DIR/.env" ]]; then
+    N8N_WORKER_COUNT=$(grep -E "^N8N_WORKER_COUNT=" "$PROJECT_DIR/.env" | cut -d'=' -f2 || echo "1")
+fi
+N8N_WORKER_COUNT=${N8N_WORKER_COUNT:-1}
+
+# Валидация N8N_WORKER_COUNT
+if ! [[ "$N8N_WORKER_COUNT" =~ ^[1-9][0-9]*$ ]]; then
+    log_error "N8N_WORKER_COUNT must be a positive integer, got: '$N8N_WORKER_COUNT'"
+    exit 1
+fi
+
+OUTPUT_FILE="$PROJECT_DIR/docker-compose.n8n-workers.yml"
+
+log_info "Generating n8n worker-runner pairs configuration..."
+log_info "N8N_WORKER_COUNT=$N8N_WORKER_COUNT"
+
+# Перезаписываем файл (идемпотентно)
+cat > "$OUTPUT_FILE" << 'EOF'
+# Auto-generated file for n8n worker-runner pairs
+# Regenerate with: bash scripts/generate_n8n_workers.sh
+# DO NOT EDIT MANUALLY - this file is overwritten on each run
+
+services:
+EOF
+
+for i in $(seq 1 "$N8N_WORKER_COUNT"); do
+cat >> "$OUTPUT_FILE" << EOF
+  n8n-worker-$i:
+    extends:
+      file: docker-compose.yml
+      service: n8n-worker-template
+    container_name: n8n-worker-$i
+    profiles: ["n8n"]
+    restart: unless-stopped
+    depends_on:
+      n8n:
+        condition: service_started
+      redis:
+        condition: service_healthy
+      postgres:
+        condition: service_healthy
+
+  n8n-runner-$i:
+    extends:
+      file: docker-compose.yml
+      service: n8n-runner-template
+    container_name: n8n-runner-$i
+    profiles: ["n8n"]
+    restart: unless-stopped
+    network_mode: "service:n8n-worker-$i"
+    depends_on:
+      n8n-worker-$i:
+        condition: service_started
+
+EOF
+done
+
+log_info "Generated $OUTPUT_FILE with $N8N_WORKER_COUNT worker-runner pair(s)"