Clean up unused code and sync Terraform state

- Remove unused Express server (server.js)
- Remove unused API route (src/pages/api/filaments.ts)
- Remove Express dependency and related scripts from package.json
- Import existing AWS domain association into Terraform
- Add domain configuration to terraform.tfvars
- Update domain association to include www and dev subdomains
- Set wait_for_verification to false to avoid timeouts

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

terraform/main.tf

@@ -100,8 +100,9 @@ resource "aws_amplify_branch" "dev" {
 resource "aws_amplify_domain_association" "filamenteka" {
   count = var.domain_name != "" ? 1 : 0
 
-  app_id      = aws_amplify_app.filamenteka.id
-  domain_name = var.domain_name
+  app_id               = aws_amplify_app.filamenteka.id
+  domain_name          = var.domain_name
+  wait_for_verification = false
 
   # Map main branch to root domain
   sub_domain {
@@ -109,6 +110,12 @@ resource "aws_amplify_domain_association" "filamenteka" {
     prefix      = ""
   }
 
+  # Map main branch to www subdomain
+  sub_domain {
+    branch_name = aws_amplify_branch.main.branch_name
+    prefix      = "www"
+  }
+
   # Map dev branch to dev subdomain
   sub_domain {
     branch_name = aws_amplify_branch.dev.branch_name