docker: bump node from 20-alpine to 26-alpine in /infra/docker

infra/docker/Dockerfile.bug-server-mock

@@ -1,5 +1,5 @@
 # Bug Server Mock - Phase 7
-FROM node:20-alpine
+FROM node:26-alpine
 
 WORKDIR /app
 

infra/docker/Dockerfile.mock-agent

@@ -1,5 +1,5 @@
 # Mock Agent Server for Testing
-FROM node:20-alpine
+FROM node:26-alpine
 
 RUN apk add --no-cache wget
 

infra/docker/Dockerfile.production

@@ -7,7 +7,7 @@
 # ============================================================
 # Stage 1: Build
 # ============================================================
-FROM node:22-alpine AS builder
+FROM node:26-alpine AS builder
 
 WORKDIR /app
 
@@ -34,7 +34,7 @@ RUN rm -rf node_modules/.cache \
 # ============================================================
 # Stage 2: Production
 # ============================================================
-FROM node:22-alpine AS production
+FROM node:26-alpine AS production
 
 # Security: Create non-root user
 RUN addgroup -g 1001 -S appgroup \

infra/docker/Dockerfile.resource-crawler

@@ -1,7 +1,7 @@
 # Resource Crawler Service Dockerfile
 # Has plugin directory structure
 
-FROM node:20-alpine
+FROM node:26-alpine
 
 RUN apk add --no-cache wget
 

infra/docker/Dockerfile.service

@@ -1,7 +1,7 @@
 # Agenium Search - Service Dockerfile
 # Used for dns-crawler, normalizer, indexer, search-api
 
-FROM node:20-alpine
+FROM node:26-alpine
 
 # Install wget for healthcheck
 RUN apk add --no-cache wget

infra/docker/Dockerfile.stub

@@ -1,7 +1,7 @@
 # Stub service Dockerfile for Phase 2
 # All services use this until business logic is implemented
 
-FROM node:22-alpine
+FROM node:26-alpine
 
 WORKDIR /app