feat(terraform): Add VPC module example

terraform/aws-infrastructure/modules/vpc/main.tf

@@ -0,0 +1,70 @@
+# VPC Module Example
+# Full implementation available in repository
+
+resource "aws_vpc" "main" {
+  cidr_block           = var.vpc_cidr
+  enable_dns_hostnames = true
+  enable_dns_support   = true
+  
+  tags = merge(var.tags, {
+    Name = var.vpc_name
+  })
+}
+
+resource "aws_internet_gateway" "main" {
+  vpc_id = aws_vpc.main.id
+  tags   = merge(var.tags, { Name = "${var.vpc_name}-igw" })
+}
+
+resource "aws_subnet" "public" {
+  count                   = length(var.public_subnet_cidrs)
+  vpc_id                  = aws_vpc.main.id
+  cidr_block              = var.public_subnet_cidrs[count.index]
+  availability_zone       = var.azs[count.index]
+  map_public_ip_on_launch = true
+  
+  tags = merge(var.tags, {
+    Name = "${var.vpc_name}-public-${var.azs[count.index]}"
+    Tier = "Public"
+  })
+}
+
+resource "aws_subnet" "private" {
+  count             = length(var.private_subnet_cidrs)
+  vpc_id            = aws_vpc.main.id
+  cidr_block        = var.private_subnet_cidrs[count.index]
+  availability_zone = var.azs[count.index]
+  
+  tags = merge(var.tags, {
+    Name = "${var.vpc_name}-private-${var.azs[count.index]}"
+    Tier = "Private"
+  })
+}
+
+resource "aws_eip" "nat" {
+  count  = var.enable_nat_gateway ? (var.single_nat_gateway ? 1 : length(var.azs)) : 0
+  domain = "vpc"
+  tags   = merge(var.tags, { Name = "${var.vpc_name}-nat-eip" })
+}
+
+resource "aws_nat_gateway" "main" {
+  count         = var.enable_nat_gateway ? (var.single_nat_gateway ? 1 : length(var.azs)) : 0
+  allocation_id = aws_eip.nat[count.index].id
+  subnet_id     = aws_subnet.public[count.index].id
+  tags          = merge(var.tags, { Name = "${var.vpc_name}-nat" })
+}
+
+# Route tables, associations, and other resources...
+# See full implementation in repository
+
+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
+}