auth,feeds,ai,ui,deploy: build Stellar

Use Effect services for requests, AI tasks, and the RSS worker.
Add admin accounts, feed sharing, and stored reading profiles.
Add Biome, Effect tools, and Podman deployment with Caddy.

.vscode/extensions.json

@@ -0,0 +1,7 @@
+{
+  "recommendations": [
+    "biomejs.biome",
+    "typescriptteam.native-preview",
+    "effectful-tech.effect-vscode"
+  ]
+}