chore: add devcontainer config and additional packages for ddev

.devcontainer/devcontainer-lock.json

@@ -0,0 +1,9 @@
+{
+  "features": {
+    "ghcr.io/anthropics/devcontainer-features/claude-code:1.0": {
+      "version": "1.0.5",
+      "resolved": "ghcr.io/anthropics/devcontainer-features/claude-code@sha256:cfc2e7d3e9fd3b9b01f8d5cb158508a884c8c0ede2e23ed10f32dea5d4ffe69a",
+      "integrity": "sha256:cfc2e7d3e9fd3b9b01f8d5cb158508a884c8c0ede2e23ed10f32dea5d4ffe69a"
+    }
+  }
+}