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.

.env.example

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+# Set the first administrator account.
+STELLAR_ADMIN_EMAIL=admin@example.com
+STELLAR_ADMIN_USERNAME=admin
+# The deploy script generates a password when this field is empty.
+STELLAR_ADMIN_PASSWORD=
+
+# Set the site address.
+DOMAIN=localhost
+APP_ORIGIN=http://localhost:8080
+HTTP_PORT=8080
+HTTPS_PORT=8443
+
+# The deploy script generates these secrets when the fields are empty.
+# Use hexadecimal characters for POSTGRES_PASSWORD.
+POSTGRES_PASSWORD=
+BETTER_AUTH_SECRET=
+
+# Set a key for each provider in AI_MODELS.
+GOOGLE_GENERATIVE_AI_API_KEY=
+OPENAI_API_KEY=
+ANTHROPIC_API_KEY=
+AI_MODELS='[{"id":"gemini-flash","name":"Gemini Flash","provider":"google","model":"gemini-flash-latest"}]'
+
+# Set the RSS worker limits.
+RSS_POLL_SECONDS=900
+RSS_CONCURRENCY=2