Add complete SACC v4 infrastructure project

- Terraform modules: VPC, EC2, RDS, S3, CloudFront, Route53, Lambda, IAM, Security Groups
- Ansible playbooks for server configuration
- Scripts: create-test-environment.sh, destroy-test-environment.sh, validate-environment.sh
- Documentation: README, QUICKSTART, AGENTS
- Jenkins pipeline for automated deployment
- Jenkins pipeline for environment destruction

terraform/modules/vpc/main.tf

@@ -0,0 +1,51 @@
+variable "vpc_cidr" {}
+variable "environment" {}
+variable "availability_zones" { type = list(string) }
+
+resource "aws_vpc" "main" {
+  cidr_block           = var.vpc_cidr
+  enable_dns_hostnames = true
+  enable_dns_support   = true
+  tags = { Name = "sacc4-vpc-${var.environment}" }
+}
+
+resource "aws_internet_gateway" "main" {
+  vpc_id = aws_vpc.main.id
+  tags   = { Name = "sacc4-igw-${var.environment}" }
+}
+
+resource "aws_subnet" "public" {
+  count                   = 2
+  vpc_id                  = aws_vpc.main.id
+  cidr_block              = cidrsubnet(var.vpc_cidr, 8, count.index + 1)
+  availability_zone       = var.availability_zones[count.index]
+  map_public_ip_on_launch = true
+  tags = { Name = "sacc4-public-${count.index + 1}-${var.environment}" }
+}
+
+resource "aws_subnet" "private" {
+  count             = 2
+  vpc_id            = aws_vpc.main.id
+  cidr_block        = cidrsubnet(var.vpc_cidr, 8, count.index + 11)
+  availability_zone = var.availability_zones[count.index]
+  tags = { Name = "sacc4-private-${count.index + 1}-${var.environment}" }
+}
+
+resource "aws_route_table" "public" {
+  vpc_id = aws_vpc.main.id
+  route {
+    cidr_block = "0.0.0.0/0"
+    gateway_id = aws_internet_gateway.main.id
+  }
+  tags = { Name = "sacc4-public-rt-${var.environment}" }
+}
+
+resource "aws_route_table_association" "public" {
+  count          = 2
+  subnet_id      = aws_subnet.public[count.index].id
+  route_table_id = aws_route_table.public.id
+}
+
+output "vpc_id" { value = aws_vpc.main.id }
+output "public_subnet_ids" { value = aws_subnet.public[*].id }
+output "private_subnet_ids" { value = aws_subnet.private[*].id }