feat: Add SearXNG module and update infrastructure

- Introduced a new SearXNG module with configuration for Kubernetes deployment, service, and ingress.
- Updated existing Terraform app modules to include SearXNG in both dev-01 and prod-01 environments.
- Added necessary variables and secrets for SearXNG in the respective Terraform files.
- Updated Dockerfiles for llama.cpp and ollama to use latest versions.
- Enhanced security and hardening defaults in Kubernetes deployments.
- Improved documentation for Copilot instructions and Terraform workflows.

terraform/apps/dev-01/secrets.tf

@@ -27,3 +27,9 @@ variable "webui_secret_key" {
   type        = string
   sensitive   = true
 }
+
+variable "searxng_secret_key" {
+  description = "The secret key for SearXNG"
+  type        = string
+  sensitive   = true
+}